The above code works (we’ve used it for TX and RX). To test the UART is working you can simply link the TX and RX pins to each other and verify minicom receives what you type. Running minicom: minicom -b 115200 -o -D /dev/serial0. Refer to the service provider for APN infoġ. Install minicom: sudo apt-get install minicom. If the status is ‘1’, the device is registered and in home network ![]() Get the registration status of the device. Wait for few seconds as AT+COPS command can take time In weak signal conditions, data throughput will be low First check SIM is not locked and it is ready # set profile 3 as using IP with APN being internet RSSI indicates the signal strength in dBm, a value of 99 reflects no signal detected or not known AT+CPIN=“1234”ĪT+IPR? : the operating baudrate should be returned, please use this baudrate in the remaining tutorialĪT+CREG? : to check the network registration status, expected response +CREG:x,1 (registered, home network) or +CREG:x,5 (roaming)ĪT+CGREG? : to check the GPRS registration status, expected response +CGREG:x,1 (registered, home network) or +CGREG:x,5 (roaming)ĪT+CSQ : returns “RSSI”,“BER”. if not, SIM PIN may be entered using the AT+CPIN command. If not, make sure the board is powered on (the VBAT led should be on) and check minicom baudrate setting (default HL baudrate should be 115200), using minicom -sĪT+CPIN? : expected response READY. The following AT commands shall be entered within minicom to perform some sanity checking:ĪT : expected response OK. Should be related to our setting: using micro-usb to connect Sierra wirelss challenge: find device, found out only /dev/ttyUSB2 works. # Wait if executing in batch command file ![]() ![]() # Get the registration status of the device. # get general deice status, including network registration # Getting network and registration status root/epc/HSS/bulk_subs_confg_in_hss.sh 1 IMSI
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