AT Commands, GSM, Bluetooth

GSM UMTS 3GPP Numbering Cross Reference AT Commands for GSM
AT Commands For GSM/GPRS Wireless Modems Reference Guide, v3 - PDF
AT Command Interface Guide, v1 - PDF
Using AT commands to send and receive SMS from a computer
Teltonika T-Modem AT commands - PDF
AT commands for modems and GSM phones

https://www.bluetooth.org/
Bluetooth ATCommand ( 學習筆記- 社群文章)
Bluetooth modules AT Command Manual - PDF
AT Command Set - PDF
Bluetooth AT Commands - PDF