def encodePayload(ftype, payload):
tmpbuf = ftype + pk('<H', len(payload))
tmpbuf += payload
crc = CRC16.calcString(tmpbuf, CRC16.INITIAL_MODBUS)
tmpbuf += pk('<H', crc)
tmpbuf += pk('B', FRAME_TAIL)
return tmpbuf
def addCRC(myHex):
#takes a hex string and adds a modbus CRC to it
crc = CRC16.calcString(myHex, CRC16.INITIAL_MODBUS)
flipped_res = "{0:#0{1}x}".format(crc, 6)
res = flipped_res[4:6] + flipped_res[2:4]
add_on = res.decode('hex')
newHex = myHex + add_on
return newHex