The document please go to : http://www.rakwireless.com/en/download
Integrate all frequency bands, support band switching, and switch frequency bands by AT command;
AT command list: \ at+region=EU868/US915/AS923/AU915/IN865/KR920 // Set device region
at+dev_eui=xxxxxxxxxxxxxxxx // Set device dev_eui \ at+app_eui=xxxxxxxxxxxxxxxx // Set device app_eui \ at+app_key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx // Set device app_key
at+dev_addr=xxxxxxxx // Set device dev_addr \ at+nwks_key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx // Set device nwks_key \ at+apps_key=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx // Set device apps_key
at+join_mode=otaa/abp // Set the device to join otaa or abp \
(Note:Please set the region first, then set the join method.) \ After the parameter setting is completed, reset the device enable parameter.