AntMesg contains definitions for ANT message IDs
Android ANT packets are in the format:
II JJ ------
where: II is the 1 byte size of the ANT message (0-249)
JJ is the 1 byte ID of the ANT message (1-255, 0 is invalid)
------ is the data of the ANT message (0-249 bytes of data)
Note, no sync byte or checksum byte is included.