This is an implementation of the DLMS/Cosem protocol in the BSD Open Source and permissive license. This protocol is mainly used in gas/water/electricity meters but is enough generic to target any IoT device.

See the official organization group to learn more: http://www.dlms.com.

This repository provides C code, mainly framing encoding/decoding functions. There is no any integration in a complete stand-alone examples. See other repositories for that purpose.

This Cosem stack has the following goals :

• Pure portable and stand-alone ANSI C99 code
• Fully unit tested with pre-defined vectors
• Client/server implementation, LogicalName referencing, LLS, HLS3, 4 and 5, security policy 1
• Examples using Cosem over TCP/IP
• Memory efficient / no dynamic allocation (static, configurable at build-time)
• Full traces
• Memory protected against buffer overflow using Array utility

• Utilities (buffer utilities)
• BER coder/decoder
• Association coders and decoders AARQ/AARE/RLRQ/RLRE (LLS)
• Secure HLS5 GMAC Authentication
• Get Request normal/by block
• Set request normal
• Action service
• Exception response in case of problem
• HDLC framing utility
• Serial port HAL (Win32/Linux)

Eclipse CDT project files are available at the root of the repository.

FIXME: before writing this section, wait for stabilization of the HAL/Cosem API and utilities

• LN with ciphering Security Policy 0 (Authenticated & encrypted)
• HLS 3, 4, 5, 6

• Multiple logical devices support
• ACCESS service
• GBT service
• ECDSA
• ECDSA data transport cyphering