Discard existing buffer held in device on conformance start up - When there are data written in to buffer before conformance connects, data will be thrown away until first 30ms without any packet pass through.
Prevent early exit when receiving reply code such as OSDP_NAK. This change will effectively remove the use of ST_OSDP_BAD_COMMAND_REPLY constant.
OSDP_NAK. This change will effectively remove the use ofST_OSDP_BAD_COMMAND_REPLYconstant.