v1.8.0 Firmware
-- 1. LoRaWAN Stack update to DR-LWS-007 (http://www.dragino.com/downloads/downloads/LoRa_End_Node/DR-LWS/changelog)
-- 2 . Add AS923-4 band and MA869 band
-- 3 .Fixed the inaccurate ranging of DF-Robot SEN0208 in mode2.
-- 4. Remove the limit of plus or minus 5Kg in mode 5, and expand from 2 bytes to 4 bytes, the unit is g.
-- 5. AT command change: AT+INTMOD is changed to AT+INTMOD1; AT command increase: AT+INTMOD2, AT+INTMOD3, AT+SETCNT.
-- 6. Added working mode 7(3Interrupt),8(3ADC+1DS18B20),9(3DS18B20+2Count)