MLLPServer Class

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The MLLPServer class implements the server side of the Minimal Lower Layer Protocol.

Syntax

class ipworksedi.MLLPServer

Remarks

The MLLPServer class is used to exchange HL7 data with one or more connected MLLP clients.

Setting up MLLPServer to Listen for Client Connections

The first step in using the MLLPServer class is to configure it to listen for MLLP client connections. Start by setting the local_port property to the desired listening port. For multi-homed devices, also set the local_host property to the address of the network interface the MLLPServer class should listen on.

Next, optionally enable TLS/SSL with the ssl_enabled and ssl_cert properties (MLLPServer supports client authentication with the ssl_authenticate_clients property).

Finally, set the listening property to True to begin listening for client connections.

Connecting Example mllpServer.LocalHost = "localhost"; mllpServer.LocalPort = 7777; // The following two lines are only necessary if using TLS/SSL. mllpServer.SSLEnabled = true; mllpServer.SSLCert = new Certificate(CertStoreTypes.cstPFXFile, "..\\path\\to\\cert.pfx", "password", "*"); mllpServer.Listening = true;

At this point the on_connection_request event will fire anytime a client wishes to connect (connection requests are accepted by default), and the on_connected event will fire each time a client successfully connects.

While clients are connected, the server may interact with them by using their oftp_connection_connection_id to interact with the class's properties.

Receiving Data

The MLLPServer class will automatically receive HL7 data sent from each client, and will automatically send acknowledgements back.

When the MLLPServer class is receiving data, immediately before data transfer begins the on_start_transfer event fires. During data transfer, one or more on_transfer events will fire. When data transfer is complete, the on_end_transfer event fires. Any errors during data delivery will cause the on_error event to fire.

Immediately before the server acknowledgement is sent the on_ack_out event fires. The Accept parameter of this event is used to determine the type of acknowledgement (ACK or NAK) to send back to the client.

HL7 data received by the MLLPServer class will be stored in one of the following ways:

• If an output file path has been set to the output_file_name property, the data is written to that file.
• Otherwise, the data is stored in the output_data property.

Sending Data

The MLLPServer class may also send data to MLLP clients. First, specify the data to send by doing one of the following:

• Set the input_file_name property to the path of a file with HL7 data.
• Set the HL7 data directly to the input_data property.

Once the data has been specified, simply call the send method with the appropriate connection Id to send the HL7 data to the associated client. Once the client has received the data, it will respond with an acknowledgement, causing the class's on_ack_in event to fire.

Sending Data Example mllpServer.Connections[connectionId].InputData = "HL7Data"; mllpServer.Send(connectionId);

Property List

The following is the full list of the properties of the class with short descriptions. Click on the links for further details.

Method List

The following is the full list of the methods of the class with short descriptions. Click on the links for further details.

Event List

The following is the full list of the events fired by the class with short descriptions. Click on the links for further details.

Config Settings

The following is a list of config settings for the class with short descriptions. Click on the links for further details.

connection_count Property

The number of records in the arrays.

Syntax

def get_connection_count() -> int: ...

connection_count = property(get_connection_count, None)

Default Value

0

Remarks

This property controls the size of the following arrays:

• connected
• connection_id
• input_data
• input_file_name
• local_address
• output_data
• output_file_name
• remote_host
• remote_port
• ssl_cert_effective_date
• ssl_cert_encoded
• ssl_cert_expiration_date
• ssl_cert_extended_key_usage
• ssl_cert_fingerprint
• ssl_cert_fingerprint_sha1
• ssl_cert_fingerprint_sha256
• ssl_cert_issuer
• ssl_cert_private_key
• ssl_cert_private_key_available
• ssl_cert_private_key_container
• ssl_cert_public_key
• ssl_cert_public_key_algorithm
• ssl_cert_public_key_length
• ssl_cert_serial_number
• ssl_cert_signature_algorithm
• ssl_cert_store
• ssl_cert_store_password
• ssl_cert_store_type
• ssl_cert_subject
• ssl_cert_subject_alt_names
• ssl_cert_thumbprint_md5
• ssl_cert_thumbprint_sha1
• ssl_cert_thumbprint_sha256
• ssl_cert_usage
• ssl_cert_usage_flags
• ssl_cert_version
• timeout

The array indices start at 0 and end at connection_count - 1.

This property is read-only.

connected Property

Triggers a connection or disconnection.

Syntax

def get_connected(connection_id: int) -> bool: ...

Default Value

FALSE

Remarks

Triggers a connection or disconnection.

This property triggers a connection or disconnection.

Setting this property to True initiates a connection attempt to the host specified by the remotehost property. If successful, the value of this property changes to True and the onconnected event is fired.

The connection_id parameter specifies the index of the item in the array. The size of the array is controlled by the connection_count property.

This property is read-only.

connection_id Property

The Id of the connection.

Syntax

def get_connection_id(connection_id: int) -> int: ...

Default Value

0

Remarks

The Id of the connection.

This property contains an identifier generated by the class that uniquely identifies the connection.

The connection_id parameter specifies the index of the item in the array. The size of the array is controlled by the connection_count property.

This property is read-only.

input_data Property

The raw HL7 data to send.

Syntax

def get_input_data(connection_id: int) -> bytes: ...
def set_input_data(connection_id: int, value: bytes) -> None: ...

Default Value

""

Remarks

The raw HL7 data to send.

This property is used to specify the HL7 data to send when the send method is called.

Note that the class checks the following places for input data, in order, when send is called. Input data is sent from the first place it is found:

• The contents of a file whose path has been set to the connection's inputfilename property.
• The data set to the connection's inputdata property.

The connection_id parameter specifies the index of the item in the array. The size of the array is controlled by the connection_count property.

input_file_name Property

The path of a file containing HL7 data to send.

Syntax

def get_input_file_name(connection_id: int) -> str: ...
def set_input_file_name(connection_id: int, value: str) -> None: ...

Default Value

""

Remarks

The path of a file containing HL7 data to send.

This property is used to specify a path to a file whose contents will be sent when the send method is called.

Note that the class checks the following places for input data, in order, when send is called. Input data is sent from the first place it is found:

• The contents of a file whose path has been set to the connection's inputfilename property.
• The data set to the connection's inputdata property.

The connection_id parameter specifies the index of the item in the array. The size of the array is controlled by the connection_count property.

local_address Property

The address of the local interface through which the connection is passing.

Syntax

def get_local_address(connection_id: int) -> str: ...

Default Value

""

Remarks

The address of the local interface through which the connection is passing.

This property reflects the address of the local network interface through which the connection is passing. This information is typically only important for multi-homed devices.

The connection_id parameter specifies the index of the item in the array. The size of the array is controlled by the connection_count property.

This property is read-only.

output_data Property

The raw HL7 data received.

Syntax

def get_output_data(connection_id: int) -> bytes: ...

Default Value

""

Remarks

The raw HL7 data received.

This property holds the raw HL7 data received from the MLLP client.

Note that the class will store output data in one of the following places, choosing the first one that is valid:

• A file whose path has been set to the connection's outputfilename property.
• The connection's outputdata property.

The connection_id parameter specifies the index of the item in the array. The size of the array is controlled by the connection_count property.

This property is read-only.

output_file_name Property

The path of a file in which to store received HL7 data.

Syntax

def get_output_file_name(connection_id: int) -> str: ...
def set_output_file_name(connection_id: int, value: str) -> None: ...

Default Value

""

Remarks

The path of a file in which to store received HL7 data.

This property is used to specify a path to a file in which to store HL7 data received from the MLLP client.

Note that the class will store output data in one of the following places, choosing the first one that is valid:

• A file whose path has been set to the connection's outputfilename property.
• The connection's outputdata property.

The connection_id parameter specifies the index of the item in the array. The size of the array is controlled by the connection_count property.

remote_host Property

The address of the MLLP client associated with the connection.

Syntax

def get_remote_host(connection_id: int) -> str: ...

Default Value

""

Remarks

The address of the MLLP client associated with the connection.

This property reflects the address of the MLLP client associated with the connection.

The connection_id parameter specifies the index of the item in the array. The size of the array is controlled by the connection_count property.

This property is read-only.

remote_port Property

The port of the MLLP client associated with the connection.

Syntax

def get_remote_port(connection_id: int) -> int: ...

Default Value

0

Remarks

The port of the MLLP client associated with the connection.

This property reflects the port of the MLLP client associated with the connection.

The connection_id parameter specifies the index of the item in the array. The size of the array is controlled by the connection_count property.

This property is read-only.

timeout Property

The timeout value, in seconds, for the connection.

Syntax

def get_timeout(connection_id: int) -> int: ...
def set_timeout(connection_id: int, value: int) -> None: ...

Default Value

0

Remarks

The timeout value, in seconds, for the connection.

This property specifies the timeout, in seconds, to use for the connection.

If set to 0, all operations return immediately, potentially failing with a WOULDBLOCK error if data can't be sent immediately.

If set to a positive value, the class will automatically retry each operation that would otherwise result in a WOULDBLOCK error for a maximum of timeout seconds.

The class will use doevents to enter an efficient wait loop during any potential waiting period, making sure that all system events are processed immediately as they arrive. This ensures that the host application does not freeze and remains responsive.

If timeout expires, and the operation is not yet complete, the class fails with an error.

Note: By default, all timeouts are inactivity timeouts, that is, the timeout period is extended by timeout seconds when any amount of data is successfully sent or received.

The default value is 0 (asynchronous operation).

The connection_id parameter specifies the index of the item in the array. The size of the array is controlled by the connection_count property.

default_timeout Property

This property includes an initial timeout value to be used by incoming connections.

Syntax

def get_default_timeout() -> int: ...
def set_default_timeout(value: int) -> None: ...

default_timeout = property(get_default_timeout, set_default_timeout)

Default Value

0

Remarks

This property is used by the class to set the operational timeout value of all inbound connections once they are established.

By default, the timeout is 0, meaning that all inbound connections will behave asynchronously.

keep_alive Property

When True, KEEPALIVE packets are enabled (for long connections).

Syntax

def get_keep_alive() -> bool: ...
def set_keep_alive(value: bool) -> None: ...

keep_alive = property(get_keep_alive, set_keep_alive)

Default Value

FALSE

Remarks

This property enables the SO_KEEPALIVE option on the incoming connections. This option prevents long connections from timing out in case of inactivity.

Note: System Transmission Control Protocol (TCP)/IP stack implementations are not required to support SO_KEEPALIVE.

This property is shared among incoming connections. When the property is set, the corresponding value is set for incoming connections as they are accepted. Existing connections are not modified.

listening Property

This property indicates whether the class is listening for incoming connections on LocalPort.

Syntax

def get_listening() -> bool: ...

listening = property(get_listening, None)

Default Value

FALSE

Remarks

This property indicates whether the class is listening for connections on the port specified by the local_port property. Use the start_listening and stop_listening methods to control whether the class is listening.

This property is read-only.

local_host Property

The name of the local host or user-assigned IP interface through which connections are initiated or accepted.

Syntax

def get_local_host() -> str: ...
def set_local_host(value: str) -> None: ...

local_host = property(get_local_host, set_local_host)

Default Value

""

Remarks

This property contains the name of the local host as obtained by the gethostname() system call, or if the user has assigned an IP address, the value of that address.

In multihomed hosts (machines with more than one IP interface) setting LocalHost to the IP address of an interface will make the class initiate connections (or accept in the case of server classs) only through that interface. It is recommended to provide an IP address rather than a hostname when setting this property to ensure the desired interface is used.

If the class is connected, the local_host property shows the IP address of the interface through which the connection is made in internet dotted format (aaa.bbb.ccc.ddd). In most cases, this is the address of the local host, except for multihomed hosts (machines with more than one IP interface).

Note: local_host is not persistent. You must always set it in code, and never in the property window.

local_port Property

This property includes the Transmission Control Protocol (TCP) port in the local host where the class listens.

Syntax

def get_local_port() -> int: ...
def set_local_port(value: int) -> None: ...

local_port = property(get_local_port, set_local_port)

Default Value

0

Remarks

This property must be set before the class can start listening. If its value is 0, then the TCP/IP subsystem picks a port number at random. The port number can be found by checking the value of this property after the class is listening (i.e., after successfully assigning True to the listening property).

The service port is not shared among servers so two classs cannot be listening on the same port at the same time.

ssl_authenticate_clients Property

If set to True, the server asks the client(s) for a certificate.

Syntax

def get_ssl_authenticate_clients() -> bool: ...
def set_ssl_authenticate_clients(value: bool) -> None: ...

ssl_authenticate_clients = property(get_ssl_authenticate_clients, set_ssl_authenticate_clients)

Default Value

FALSE

Remarks

This property is used in conjunction with the on_ssl_client_authentication event. Please refer to the documentation of the on_ssl_client_authentication event for details.

ssl_cert_effective_date Property

The date on which this certificate becomes valid.

Syntax

def get_ssl_cert_effective_date() -> str: ...

ssl_cert_effective_date = property(get_ssl_cert_effective_date, None)

Default Value

""

Remarks

The date on which this certificate becomes valid. Before this date, it is not valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2000 15:00:00.

This property is read-only.

ssl_cert_expiration_date Property

The date on which the certificate expires.

Syntax

def get_ssl_cert_expiration_date() -> str: ...

ssl_cert_expiration_date = property(get_ssl_cert_expiration_date, None)

Default Value

""

Remarks

The date on which the certificate expires. After this date, the certificate will no longer be valid. The date is localized to the system's time zone. The following example illustrates the format of an encoded date:

23-Jan-2001 15:00:00.

This property is read-only.

ssl_cert_extended_key_usage Property

A comma-delimited list of extended key usage identifiers.

Syntax

def get_ssl_cert_extended_key_usage() -> str: ...

ssl_cert_extended_key_usage = property(get_ssl_cert_extended_key_usage, None)

Default Value

""

Remarks

A comma-delimited list of extended key usage identifiers. These are the same as ASN.1 object identifiers (OIDs).

This property is read-only.

ssl_cert_fingerprint Property

The hex-encoded, 16-byte MD5 fingerprint of the certificate.

Syntax

def get_ssl_cert_fingerprint() -> str: ...

ssl_cert_fingerprint = property(get_ssl_cert_fingerprint, None)

Default Value

""

Remarks

The hex-encoded, 16-byte MD5 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: bc:2a:72:af:fe:58:17:43:7a:5f:ba:5a:7c:90:f7:02

This property is read-only.

ssl_cert_fingerprint_sha1 Property

The hex-encoded, 20-byte SHA-1 fingerprint of the certificate.

Syntax

def get_ssl_cert_fingerprint_sha1() -> str: ...

ssl_cert_fingerprint_sha1 = property(get_ssl_cert_fingerprint_sha1, None)

Default Value

""

Remarks

The hex-encoded, 20-byte SHA-1 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: 30:7b:fa:38:65:83:ff:da:b4:4e:07:3f:17:b8:a4:ed:80:be:ff:84

This property is read-only.

ssl_cert_fingerprint_sha256 Property

The hex-encoded, 32-byte SHA-256 fingerprint of the certificate.

Syntax

def get_ssl_cert_fingerprint_sha256() -> str: ...

ssl_cert_fingerprint_sha256 = property(get_ssl_cert_fingerprint_sha256, None)

Default Value

""

Remarks

The hex-encoded, 32-byte SHA-256 fingerprint of the certificate. This property is primarily used for keys which do not have a corresponding X.509 public certificate, such as PEM keys that only contain a private key. It is commonly used for SSH keys.

The following example illustrates the format: 6a:80:5c:33:a9:43:ea:b0:96:12:8a:64:96:30:ef:4a:8a:96:86:ce:f4:c7:be:10:24:8e:2b:60:9e:f3:59:53

This property is read-only.

ssl_cert_issuer Property

The issuer of the certificate.

Syntax

def get_ssl_cert_issuer() -> str: ...

ssl_cert_issuer = property(get_ssl_cert_issuer, None)

Default Value

""

Remarks

The issuer of the certificate. This property contains a string representation of the name of the issuing authority for the certificate.

This property is read-only.

ssl_cert_private_key Property

The private key of the certificate (if available).

Syntax

def get_ssl_cert_private_key() -> str: ...

ssl_cert_private_key = property(get_ssl_cert_private_key, None)

Default Value

""

Remarks

The private key of the certificate (if available). The key is provided as PEM/Base64-encoded data.

Note: The privatekey may be available but not exportable. In this case, privatekey returns an empty string.

This property is read-only.

ssl_cert_private_key_available Property

Whether a PrivateKey is available for the selected certificate.

Syntax

def get_ssl_cert_private_key_available() -> bool: ...

ssl_cert_private_key_available = property(get_ssl_cert_private_key_available, None)

Default Value

FALSE

Remarks

Whether a privatekey is available for the selected certificate. If privatekeyavailable is True, the certificate may be used for authentication purposes (e.g., server authentication).

This property is read-only.

ssl_cert_private_key_container Property

The name of the PrivateKey container for the certificate (if available).

Syntax

def get_ssl_cert_private_key_container() -> str: ...

ssl_cert_private_key_container = property(get_ssl_cert_private_key_container, None)

Default Value

""

Remarks

The name of the privatekey container for the certificate (if available). This functionality is available only on Windows platforms.

This property is read-only.

ssl_cert_public_key Property

The public key of the certificate.

Syntax

def get_ssl_cert_public_key() -> str: ...

ssl_cert_public_key = property(get_ssl_cert_public_key, None)

Default Value

""

Remarks

The public key of the certificate. The key is provided as PEM/Base64-encoded data.

This property is read-only.

ssl_cert_public_key_algorithm Property

The textual description of the certificate's public key algorithm.

Syntax

def get_ssl_cert_public_key_algorithm() -> str: ...

ssl_cert_public_key_algorithm = property(get_ssl_cert_public_key_algorithm, None)

Default Value

""

Remarks

The textual description of the certificate's public key algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSADH") or an object identifier (OID) string representing the algorithm.

This property is read-only.

ssl_cert_public_key_length Property

The length of the certificate's public key (in bits).

Syntax

def get_ssl_cert_public_key_length() -> int: ...

ssl_cert_public_key_length = property(get_ssl_cert_public_key_length, None)

Default Value

0

Remarks

The length of the certificate's public key (in bits). Common values are 512, 1024, and 2048.

This property is read-only.

ssl_cert_serial_number Property

The serial number of the certificate encoded as a string.

Syntax

def get_ssl_cert_serial_number() -> str: ...

ssl_cert_serial_number = property(get_ssl_cert_serial_number, None)

Default Value

""

Remarks

The serial number of the certificate encoded as a string. The number is encoded as a series of hexadecimal digits, with each pair representing a byte of the serial number.

This property is read-only.

ssl_cert_signature_algorithm Property

The text description of the certificate's signature algorithm.

Syntax

def get_ssl_cert_signature_algorithm() -> str: ...

ssl_cert_signature_algorithm = property(get_ssl_cert_signature_algorithm, None)

Default Value

""

Remarks

The text description of the certificate's signature algorithm. The property contains either the name of the algorithm (e.g., "RSA" or "RSAMD5RSA") or an object identifier (OID) string representing the algorithm.

This property is read-only.

ssl_cert_store Property

The name of the certificate store for the client certificate.

Syntax

def get_ssl_cert_store() -> bytes: ...
def set_ssl_cert_store(value: bytes) -> None: ...

ssl_cert_store = property(get_ssl_cert_store, set_ssl_cert_store)

Default Value

"MY"

Remarks

The name of the certificate store for the client certificate.

The storetype property denotes the type of the certificate store specified by store. If the store is password-protected, specify the password in storepassword.

store is used in conjunction with the subject property to specify client certificates. If store has a value, and subject or encoded is set, a search for a certificate is initiated. Please see the subject property for details.

Designations of certificate stores are platform dependent.

The following designations are the most common User and Machine certificate stores in Windows:

When the certificate store type is cstPFXFile, this property must be set to the name of the file. When the type is cstPFXBlob, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

ssl_cert_store_password Property

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

Syntax

def get_ssl_cert_store_password() -> str: ...
def set_ssl_cert_store_password(value: str) -> None: ...

ssl_cert_store_password = property(get_ssl_cert_store_password, set_ssl_cert_store_password)

Default Value

""

Remarks

If the type of certificate store requires a password, this property is used to specify the password needed to open the certificate store.

ssl_cert_store_type Property

The type of certificate store for this certificate.

Syntax

def get_ssl_cert_store_type() -> int: ...
def set_ssl_cert_store_type(value: int) -> None: ...

ssl_cert_store_type = property(get_ssl_cert_store_type, set_ssl_cert_store_type)

Default Value

0

Remarks

The type of certificate store for this certificate.

The class supports both public and private keys in a variety of formats. When the cstAuto value is used, the class will automatically determine the type. This property can take one of the following values:

ssl_cert_subject_alt_names Property

Comma-separated lists of alternative subject names for the certificate.

Syntax

def get_ssl_cert_subject_alt_names() -> str: ...

ssl_cert_subject_alt_names = property(get_ssl_cert_subject_alt_names, None)

Default Value

""

Remarks

Comma-separated lists of alternative subject names for the certificate.

This property is read-only.

ssl_cert_thumbprint_md5 Property

The MD5 hash of the certificate.

Syntax

def get_ssl_cert_thumbprint_md5() -> str: ...

ssl_cert_thumbprint_md5 = property(get_ssl_cert_thumbprint_md5, None)

Default Value

""

Remarks

The MD5 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

This property is read-only.

ssl_cert_thumbprint_sha1 Property

The SHA-1 hash of the certificate.

Syntax

def get_ssl_cert_thumbprint_sha1() -> str: ...

ssl_cert_thumbprint_sha1 = property(get_ssl_cert_thumbprint_sha1, None)

Default Value

""

Remarks

The SHA-1 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

This property is read-only.

ssl_cert_thumbprint_sha256 Property

The SHA-256 hash of the certificate.

Syntax

def get_ssl_cert_thumbprint_sha256() -> str: ...

ssl_cert_thumbprint_sha256 = property(get_ssl_cert_thumbprint_sha256, None)

Default Value

""

Remarks

The SHA-256 hash of the certificate. It is primarily used for X.509 certificates. If the hash does not already exist, it is automatically computed.

This property is read-only.

ssl_cert_usage Property

The text description of UsageFlags .

Syntax

def get_ssl_cert_usage() -> str: ...

ssl_cert_usage = property(get_ssl_cert_usage, None)

Default Value

""

Remarks

The text description of usageflags.

This value will be one or more of the following strings and will be separated by commas:

• Digital Signature
• Non-Repudiation
• Key Encipherment
• Data Encipherment
• Key Agreement
• Certificate Signing
• CRL Signing
• Encipher Only

If the provider is OpenSSL, the value is a comma-separated list of X.509 certificate extension names.

This property is read-only.

ssl_cert_usage_flags Property

The flags that show intended use for the certificate.

Syntax

def get_ssl_cert_usage_flags() -> int: ...

ssl_cert_usage_flags = property(get_ssl_cert_usage_flags, None)

Default Value

0

Remarks

The flags that show intended use for the certificate. The value of usageflags is a combination of the following flags:

Please see the usage property for a text representation of usageflags.

This functionality currently is not available when the provider is OpenSSL.

This property is read-only.

ssl_cert_version Property

The certificate's version number.

Syntax

def get_ssl_cert_version() -> str: ...

ssl_cert_version = property(get_ssl_cert_version, None)

Default Value

""

Remarks

The certificate's version number. The possible values are the strings "V1", "V2", and "V3".

This property is read-only.

ssl_cert_subject Property

The subject of the certificate used for client authentication.

Syntax

def get_ssl_cert_subject() -> str: ...
def set_ssl_cert_subject(value: str) -> None: ...

ssl_cert_subject = property(get_ssl_cert_subject, set_ssl_cert_subject)

Default Value

""

Remarks

The subject of the certificate used for client authentication.

This property must be set after all other certificate properties are set. When this property is set, a search is performed in the current certificate store to locate a certificate with a matching subject.

If a matching certificate is found, the property is set to the full subject of the matching certificate.

If an exact match is not found, the store is searched for subjects containing the value of the property.

If a match is still not found, the property is set to an empty string, and no certificate is selected.

The special value "*" picks a random certificate in the certificate store.

The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=support@nsoftware.com". Common fields and their meanings are as follows:

If a field value contains a comma, it must be quoted.

ssl_cert_encoded Property

The certificate (PEM/Base64 encoded).

Syntax

def get_ssl_cert_encoded() -> bytes: ...
def set_ssl_cert_encoded(value: bytes) -> None: ...

ssl_cert_encoded = property(get_ssl_cert_encoded, set_ssl_cert_encoded)

Default Value

""

Remarks

The certificate (PEM/Base64 encoded). This property is used to assign a specific certificate. The store and subject properties also may be used to specify a certificate.

When encoded is set, a search is initiated in the current store for the private key of the certificate. If the key is found, subject is updated to reflect the full subject of the selected certificate; otherwise, subject is set to an empty string.

ssl_enabled Property

This property indicates whether Transport Layer Security/Secure Sockets Layer (TLS/SSL) is enabled.

Syntax

def get_ssl_enabled() -> bool: ...
def set_ssl_enabled(value: bool) -> None: ...

ssl_enabled = property(get_ssl_enabled, set_ssl_enabled)

Default Value

FALSE

Remarks

This property specifies whether TLS/SSL is enabled in the class. When False (default), the class operates in plaintext mode. When True, TLS/SSL is enabled.

TLS/SSL may also be enabled by setting ssl_start_mode. Setting ssl_start_mode will automatically update this property value.

version Property

The MLLP version to use.

Syntax

def get_version() -> int: ...
def set_version(value: int) -> None: ...

version = property(get_version, set_version)

Default Value

2

Remarks

This property specifies the MLLP version the class should use. Valid values are:

• mvVersion1 (1) - MLLP Version 1
• mvVersion2 (2) - MLLP Version 2 (default)

When using MLLP version 1, there are no acknowledgements, so the on_ack_in and on_ack_out events will never fire.

config Method

Sets or retrieves a configuration setting.

Syntax

def config(configuration_string: str) -> str: ...

Remarks

config is a generic method available in every class. It is used to set and retrieve configuration settings for the class.

These settings are similar in functionality to properties, but they are rarely used. In order to avoid "polluting" the property namespace of the class, access to these internal properties is provided through the config method.

To set a configuration setting named PROPERTY, you must call Config("PROPERTY=VALUE"), where VALUE is the value of the setting expressed as a string. For boolean values, use the strings "True", "False", "0", "1", "Yes", or "No" (case does not matter).

To read (query) the value of a configuration setting, you must call Config("PROPERTY"). The value will be returned as a string.

disconnect Method

This method disconnects the specified client.

Syntax

def disconnect(connection_id: int) -> None: ...

Remarks

Calling this method will disconnect the client specified by the ConnectionId parameter.

do_events Method

This method processes events from the internal message queue.

Syntax

def do_events() -> None: ...

Remarks

When do_events is called, the class processes any available events. If no events are available, it waits for a preset period of time, and then returns.

interrupt Method

This method interrupts a synchronous send to the remote host.

Syntax

def interrupt(connection_id: int) -> None: ...

Remarks

This property is called using the Connection Id if you wish to interrupt a connection and stop a file from uploading without disconnecting the client connected to the class. If you use send_file to upload a file, the class will run synchronously on that Connection Id until it is completed.

reset Method

This method will reset the class.

Syntax

def reset() -> None: ...

Remarks

This method will reset the class's properties to their default values.

send Method

Send HL7 data to the MLLP client associated with the specified connection Id.

Syntax

def send(connection_id: int) -> None: ...

Remarks

The send method sends data for the connection specified by ConnectionId to the associated MLLP client.

Before calling this method, specify the data to send by doing one of the following (the class will use the data from the first valid location):

• Set the input_file_name property to the path of a file with HL7 data.
• Set the HL7 data directly to the input_data property.

ConnectionId is the connected client to which the server should send.

Once the client has received the data, it will respond with an acknowledgement, causing the class's on_ack_in event to fire.

Sending Data Example mllpServer.Connections[connectionId].InputData = "HL7Data"; mllpServer.Send(connectionId);

shutdown Method

This method shuts down the server.

Syntax

def shutdown() -> None: ...

Remarks

This method shuts down the server. Calling this method is equivalent to calling stop_listening and then breaking every client connection by calling disconnect.

start_listening Method

This method starts listening for incoming connections.

Syntax

def start_listening() -> None: ...

Remarks

This method begins listening for incoming connections on the port specified by local_port. Once listening, events will fire as new clients connect and data are transferred.

To stop listening for new connections, call stop_listening. To stop listening for new connections and to disconnect all existing clients, call shutdown.

stop_listening Method

This method stops listening for new connections.

Syntax

def stop_listening() -> None: ...

Remarks

This method stops listening for new connections. After being called, any new connection attempts will be rejected. Calling this method does not disconnect existing connections.

To stop listening and to disconnect all existing clients, call shutdown instead.

on_ack_in Event

Fires immediately after receiving an acknowledgement from a client.

Syntax

class MLLPServerAckInEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def accepted() -> bool: ...

# In class MLLPServer:
@property
def on_ack_in() -> Callable[[MLLPServerAckInEventParams], None]: ...
@on_ack_in.setter
def on_ack_in(event_hook: Callable[[MLLPServerAckInEventParams], None]) -> None: ...

Remarks

This event fires immediately after receiving an acknowledgement (positive or negative) from an MLLP client.

The ConnectionId parameter reflects the Id of the connection that the acknowledgement was received on.

The Accepted parameter reflects whether the acknowledgement is positive (ACK - True) or negative (NAK - False).

Anytime a negative acknowledgement is received, the class will report an error with code 670.

on_ack_out Event

Fires immediately before sending an acknowledgement to a client.

Syntax

class MLLPServerAckOutEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def accept() -> bool: ...
  @accept.setter
  def accept(value) -> None: ...

# In class MLLPServer:
@property
def on_ack_out() -> Callable[[MLLPServerAckOutEventParams], None]: ...
@on_ack_out.setter
def on_ack_out(event_hook: Callable[[MLLPServerAckOutEventParams], None]) -> None: ...

Remarks

This event fires immediately before the class sends an acknowledgement to an MLLP client.

ConnectionId is the Id of the connection that will receive the acknowledgement.

The Accept parameter should be set to indicate whether the class should send a positive (ACK - True) or negative (NAK - False) acknowledgement. The default is True.

on_connected Event

This event is fired immediately after a connection completes (or fails).

Syntax

class MLLPServerConnectedEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def status_code() -> int: ...

  @property
  def description() -> str: ...

# In class MLLPServer:
@property
def on_connected() -> Callable[[MLLPServerConnectedEventParams], None]: ...
@on_connected.setter
def on_connected(event_hook: Callable[[MLLPServerConnectedEventParams], None]) -> None: ...

Remarks

If the connection is made normally, StatusCode is 0, and Description is "OK".

If the connection fails, StatusCode has the error code returned by the system. Description contains a description of this code. The value of StatusCode is equal to the value of the system error.

Please refer to the Error Codes section for more information.

on_connection_request Event

This event is fired when a request for connection comes from a remote host.

Syntax

class MLLPServerConnectionRequestEventParams(object):
  @property
  def address() -> str: ...

  @property
  def port() -> int: ...

  @property
  def accept() -> bool: ...
  @accept.setter
  def accept(value) -> None: ...

# In class MLLPServer:
@property
def on_connection_request() -> Callable[[MLLPServerConnectionRequestEventParams], None]: ...
@on_connection_request.setter
def on_connection_request(event_hook: Callable[[MLLPServerConnectionRequestEventParams], None]) -> None: ...

Remarks

This event indicates an incoming connection. The connection is accepted by default. Address and Port will contain information about the remote host requesting the inbound connection. If you want to refuse it, you can set the Accept parameter to False.

on_disconnected Event

This event is fired when a connection is closed.

Syntax

class MLLPServerDisconnectedEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def status_code() -> int: ...

  @property
  def description() -> str: ...

# In class MLLPServer:
@property
def on_disconnected() -> Callable[[MLLPServerDisconnectedEventParams], None]: ...
@on_disconnected.setter
def on_disconnected(event_hook: Callable[[MLLPServerDisconnectedEventParams], None]) -> None: ...

Remarks

If the connection is broken normally, StatusCode is 0, and Description is "OK".

If the connection is broken for any other reason, StatusCode has the error code returned by the system. Description contains a description of this code. The value of StatusCode is equal to the value of the system error.

Please refer to the Error Codes section for more information.

on_end_transfer Event

Fires after incoming HL7 data finishes transferring.

Syntax

class MLLPServerEndTransferEventParams(object):
  @property
  def connection_id() -> int: ...

# In class MLLPServer:
@property
def on_end_transfer() -> Callable[[MLLPServerEndTransferEventParams], None]: ...
@on_end_transfer.setter
def on_end_transfer(event_hook: Callable[[MLLPServerEndTransferEventParams], None]) -> None: ...

Remarks

This event fires after incoming HL7 data finishes transferring, immediately before the on_ack_out event is fired.

ConnectionId is the Id of the connection on which the data was received.

on_error Event

This event fires information about errors during data delivery.

Syntax

class MLLPServerErrorEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def error_code() -> int: ...

  @property
  def description() -> str: ...

# In class MLLPServer:
@property
def on_error() -> Callable[[MLLPServerErrorEventParams], None]: ...
@on_error.setter
def on_error(event_hook: Callable[[MLLPServerErrorEventParams], None]) -> None: ...

Remarks

The on_error event is fired in case of exceptional conditions during message processing. Normally, the class fails with an error.

ErrorCode contains an error code and Description contains a textual description of the error. For a list of valid error codes and their descriptions, please refer to the Error Codes section.

ConnectionId indicates the connection for which the error is applicable.

on_log Event

Provides logging information.

Syntax

class MLLPServerLogEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def log_level() -> int: ...

  @property
  def message() -> str: ...

  @property
  def log_type() -> str: ...

# In class MLLPServer:
@property
def on_log() -> Callable[[MLLPServerLogEventParams], None]: ...
@on_log.setter
def on_log(event_hook: Callable[[MLLPServerLogEventParams], None]) -> None: ...

Remarks

This event fires when processing messages and provides logging information. The LogLevel configuration setting specifies the level of detail that is logged.

ConnectionId reflects the Id of the connection to which the log message pertains.

LogType specifies the type of log message. Possible values are:

• INFO
• VERBOSE
• DEBUG

LogMessage is the log message.

on_ssl_client_authentication Event

This event is fired when the client presents its credentials to the server.

Syntax

class MLLPServerSSLClientAuthenticationEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def cert_encoded() -> bytes: ...

  @property
  def cert_subject() -> str: ...

  @property
  def cert_issuer() -> str: ...

  @property
  def status() -> str: ...

  @property
  def accept() -> bool: ...
  @accept.setter
  def accept(value) -> None: ...

# In class MLLPServer:
@property
def on_ssl_client_authentication() -> Callable[[MLLPServerSSLClientAuthenticationEventParams], None]: ...
@on_ssl_client_authentication.setter
def on_ssl_client_authentication(event_hook: Callable[[MLLPServerSSLClientAuthenticationEventParams], None]) -> None: ...

Remarks

This event enables the server to decide whether or not to continue. The Accept parameter is a recommendation on whether to continue or to close the connection. This is just a suggestion: application software must use its own logic to determine whether or not to continue.

When Accept is False, Status shows why the verification failed (otherwise, Status contains the string "OK").

on_ssl_connection_request Event

This event fires when a Secure Sockets Layer (SSL) connection is requested.

Syntax

class MLLPServerSSLConnectionRequestEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def supported_cipher_suites() -> str: ...

  @property
  def supported_signature_algs() -> str: ...

  @property
  def cert_store_type() -> int: ...
  @cert_store_type.setter
  def cert_store_type(value) -> None: ...

  @property
  def cert_store() -> str: ...
  @cert_store.setter
  def cert_store(value) -> None: ...

  @property
  def cert_password() -> str: ...
  @cert_password.setter
  def cert_password(value) -> None: ...

  @property
  def cert_subject() -> str: ...
  @cert_subject.setter
  def cert_subject(value) -> None: ...

# In class MLLPServer:
@property
def on_ssl_connection_request() -> Callable[[MLLPServerSSLConnectionRequestEventParams], None]: ...
@on_ssl_connection_request.setter
def on_ssl_connection_request(event_hook: Callable[[MLLPServerSSLConnectionRequestEventParams], None]) -> None: ...

Remarks

This event fires when an SSL connection is requested and ssl_provider is set to Internal. This event provides an opportunity to select an alternative certificate to the connecting client. This event does not fire when ssl_provider is set to Platform.

This event allows the class to be configured to use both RSA and ECDSA certificates depending on the connecting client's capabilities.

ConnectionId is the connection Id of the client requesting the connection.

SupportedCipherSuites is a comma-separated list of cipher suites that the client supports.

SupportedSignatureAlgs is a comma-separated list of certificate signature algorithms that the client supports.

CertStoreType is the store type of the alternate certificate to use for this connection. The class supports both public and private keys in a variety of formats. When the cstAuto value is used, the class will automatically determine the type. This property can take one of the following values:

CertStore is the store name or location of the alternate certificate to use for this connection.

Designations of certificate stores are platform dependent.

The following designations are the most common User and Machine certificate stores in Windows:

When the certificate store type is cstPFXFile, this property must be set to the name of the file. When the type is cstPFXBlob, the property must be set to the binary contents of a PFX file (i.e., PKCS#12 certificate store).

CertPassword is the password of the certificate store containing the alternate certificate to use for this connection.

CertSubject is the subject of the alternate certificate to use for this connection.

The special value * matches any subject and will select the first certificate in the store. The certificate subject is a comma-separated list of distinguished name fields and values. For instance, "CN=www.server.com, OU=test, C=US, E=support@nsoftware.com". Common fields and their meanings are as follows:

If a field value contains a comma, it must be quoted.

on_ssl_status Event

This event is fired to show the progress of the secure connection.

Syntax

class MLLPServerSSLStatusEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def message() -> str: ...

# In class MLLPServer:
@property
def on_ssl_status() -> Callable[[MLLPServerSSLStatusEventParams], None]: ...
@on_ssl_status.setter
def on_ssl_status(event_hook: Callable[[MLLPServerSSLStatusEventParams], None]) -> None: ...

Remarks

The event is fired for informational and logging purposes only. It is used to track the progress of the connection.

on_start_transfer Event

Fires before incoming HL7 data begins transferring.

Syntax

class MLLPServerStartTransferEventParams(object):
  @property
  def connection_id() -> int: ...

# In class MLLPServer:
@property
def on_start_transfer() -> Callable[[MLLPServerStartTransferEventParams], None]: ...
@on_start_transfer.setter
def on_start_transfer(event_hook: Callable[[MLLPServerStartTransferEventParams], None]) -> None: ...

Remarks

This event fires before incoming HL7 data begins transferring.

ConnectionId is the Id of the connection on which data is being received.

on_transfer Event

Fires during incoming data transfer.

Syntax

class MLLPServerTransferEventParams(object):
  @property
  def connection_id() -> int: ...

  @property
  def bytes_transferred() -> int: ...

  @property
  def data() -> bytes: ...

# In class MLLPServer:
@property
def on_transfer() -> Callable[[MLLPServerTransferEventParams], None]: ...
@on_transfer.setter
def on_transfer(event_hook: Callable[[MLLPServerTransferEventParams], None]) -> None: ...

Remarks

This event fires one or more times while incoming data is being transferred.

The ConnectionId parameter is the Id of the connection on which data is being transferred.

The BytesTransferred parameter reflects the number of bytes transferred since the beginning of the transfer.

The Data parameter contains the portion of the data being delivered currently.

MLLPServer Config Settings

MLLPServer Config Settings

TCPClient Config Settings

SSL Config Settings

-----BEGIN CERTIFICATE-----
MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw
... Intermediate Cert ...
eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w
F0I1XhM+pKj7FjDr+XNj
-----END CERTIFICATE-----
\r \n
-----BEGIN CERTIFICATE-----
MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp
... Root Cert ...
d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA
-----END CERTIFICATE-----

-----BEGIN CERTIFICATE-----
MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw
... Intermediate Cert ...
eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w
F0I1XhM+pKj7FjDr+XNj
-----END CERTIFICATE-----
\r \n
-----BEGIN CERTIFICATE-----
MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp
... Root Cert ...
d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA
-----END CERTIFICATE-----

-----BEGIN CERTIFICATE-----
MIIEKzCCAxOgAwIBAgIRANTET4LIkxdH6P+CFIiHvTowDQYJKoZIhvcNAQELBQAw
... Intermediate Cert...
eWHV5OW1K53o/atv59sOiW5K3crjFhsBOd5Q+cJJnU+SWinPKtANXMht+EDvYY2w
F0I1XhM+pKj7FjDr+XNj
-----END CERTIFICATE-----
\r \n
-----BEGIN CERTIFICATE-----
MIIEFjCCAv6gAwIBAgIQetu1SMxpnENAnnOz1P+PtTANBgkqhkiG9w0BAQUFADBp
... Root Cert...
d8q23djXZbVYiIfE9ebr4g3152BlVCHZ2GyPdjhIuLeH21VbT/dyEHHA
-----END CERTIFICATE-----

Socket Config Settings

Base Config Settings

MLLPServer Errors

MLLPServer Errors

TCPClient Errors

TCP/IP Errors