Nordic nRF91 series

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Vendor's AT commands manual

nRF91 AT Commands
https://infocenter.nordicsemi.com/topic/ref_at_commands/REF/at_commands/intro.html

Specific AT commands for Serial LTE Modem (SLM)
https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/serial_lte_modem/doc/AT_commands_intro.html

General AT Commands

Purpose	Command String
Configure/start a manual network selection	AT+COPS=[,[,[,]]] For example: AT+COPS=1,2,"26201"
Check the received signal quality	AT%XMONITOR %XMONITOR: <reg_status>,[<full_name>,<short_name>,,,,,<cell_id>,<phys_cell_id>,,,,<NW-provided_eDRX_value>,,]
Check the supported/configured bands of the UE	AT%XCBAND
Check the network registration status	AT+CEREG?
Configure the APN for IP-based connection	AT+CGDCONT=0,"IP",""
Configure/activate the PSM mode	AT+CPSMS=[[,<Requested_Periodic-RAU>[,<Requested_GPRS-READYtimer>[,<Requested_Periodic-TAU>[,<Requested_Active-Time>]]]]]
Initialization and resuming of firmware over the air (FOTA) updates	AT+UCOAPFWT=0 Note: This AT command is used to resume FOTA transfer after interruption: AT+UCOAPFWT=<remaining_blocks>
Check the firmware version	AT+CGMR
Check the hardware version	AT%HWVERSION
Modify the supported bands of the UE	AT%XBANDLOCK=[,<band_mask>] 0 – Remove band locks 1 – Set permanent band mask 2 – Set runtime band mask <band_mask><permanent_lock><run-time_lock> String. Bit string, LSB is band 1. Leading zeroes can be omitted. Maximum length 88 characters. The following command example sets runtime band 4 and 13 lock: AT%XBANDLOCK=2,"1000000001000" OK
Switch ON / OFF the transceiver	AT+CFUN=0 / AT+CFUN=1; AT+CGATT=1

AT Commands for Communication Protocols

Purpose	Command String
Configure/activate Rel. 13 Early Release Assistance Indicator	AT%XRAI[=] Release assistance information sent to the network. 0 – Undefined, default 3 – Control plane one response. For more information, see 3GPP TS 24.301, subclause 9.9.4.25 Release assistance indication. 4 – Control plane no response. For more information, see 3GPP TS 24.301, subclause 9.9.4.25 Release assistance indication.
Configure/activate the eDRX mode	AT+CEDRXS=[,[,[,<Requested_eDRX_value>]]]
Modify eDRX parameters
Create a TCP/UDP socket and send data to remote via socket
Send data to remote via socket