MQTMC_* (Trigger message character format structure)

See:

MQTMC_STRUC_ID "TMCb"
MQTMC_STRUC_ID_ARRAY 'T','M','C','b'
MQTMC_VERSION_1 "bbb1"
MQTMC_VERSION_2 "bbb2"
MQTMC_CURRENT_VERSION "bbb2"
MQTMC_VERSION_1_ARRAY 'b','b','b','1'
MQTMC_VERSION_2_ARRAY 'b','b','b','2'
MQTMC_CURRENT_VERSION_ARRAY 'b','b','b','2'