Minimum Lower Layer Protocol (MLLP)

MLLP is a protocol used to transfer HL7v3 messages via TCP/IP. It defines leading and trailing delimiters that can help the receiving applications determine the start and end of a HL7 message. MLLP is inherently Synchronous, because external systems almost always require the order of messages to be maintained.

MLLPv2 is a requirement for transmitting HL7v3 content. It adds the concept of Commit Acknowledgements to make the protocol more reliable.

The MLLP Adapter is a TCP/IP socket adapter that uses the MLLP protocol.