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Because of the multi telegrams it is impossible to use a fixed buffer for XML output on the stack. Now the buffer is allocated on the heap. These also leads to a change in return behaviour for all XML functions, because it's possible that the buffer is NULL. For variable data this buffer grows every time there are less than 1024 bytes left for a new record.
libmbus: M-bus Library from Raditex Control (http://www.rscada.se) libmbus is an open source library for the M-bus (Meter-Bus) protocol. The Meter-Bus is a standard for reading out meter data from electricity meters, heat meters, gas meters, etc. The M-bus standard deals with both the electrical signals on the M-Bus, and the protocol and data format used in transmissions on the M-Bus. The role of libmbus is to decode/encode M-bus data, and to handle the communication with M-Bus devices. For more information see http://www.rscada.se/libmbus