@sasoo The code by christianc is incomplete and does not work The AT+CRX and AT+CTX are test commands, not meant for this application, and take your asr6501 in a dead loop, see documentation When doing this with an antenna connected, you might transmit without knowing you do, and cause interference for others In fact it seems Peer to Peer LoRa with asr6501 is not possible, it is designed for only LoRaWan, if I am not mistaken... from documentation: Notice, When enter into CTX Test, system enter into dead-loop, if you need other test then reboot the board for the next other test command. from documentation: Notice, When enter into CRX Test, system enter into dead-loop, if you need other test then reboot the board for the next other test command.