scope:

This International Standard specifies a connection-less and a connection oriented transport layer (TL) for DLMS/COSEM communication profiles used on IP networks. These TLs provide OSI-style services to the service user DLMS/COSEM AL. The connection less TL is based on the Internet Standard User Datagram Protocol (UDP). The connection oriented TL is based on the Internet Standard Transmission Control Protocol (TCP). Although the major part of the DLMS/COSEM TLs is the UDP and TCP as they are specified in the relevant Internet Standards, they include an additional sublayer, called wrapper. Annex A shows how the OSI-style TL services can be converted to and from UDP and TCP function calls.