In this project I'm using a nodeMCU for green-house control and a SIM800C for remote access. It supports DTMF, when the DTMF function is enabled, you can get the character feedback from the conversion of button pressed down during the call, which can be used for remote control. In multi-link mode, the SIM800 serial module can only work in non-transparent mode. @TisteAndii. Run minicom for serial port debugging, enter in the terminal: 4. Open /boot/config.txt file, make sure the state below is added to the file: Connect the SIM800C GSM/GPRS HAT to the Jetson Nano, press the PWRKER key for two seconds, and then turn it on. The TCP/IP application of the SIM800 serial module has two connection modes, which can be set by the command AT CIPMUX=. Quad-band 850/900/1800/1900MHz. Is there a legal reason that organizations often refuse to comment on an issue citing "ongoing litigation"? For reading messages use AT+CMGR=20. Integrated USB to serial port chip, you can plug directly into the computer to debug. 3. After the transmission is done, the module returns +CMGS:15 to confirm the transmission is successful. Replacing atmega8 with atmega328 on Arduino Single-Sided Serial Board, less expensive alternative arduino board to CMUcam4, Trouble programming custom ATMEGA2560 board. Learn More, Description: rev2023.6.2.43474. Here, we take a look at the SIM800C GSM-GPRS-BT Shield by ROHS. AT+CMGS="phone number", sets the recipient's mobile number, and then returns: ">". luismorais Enter the bcm2835 directory under SIM800C, compile and install the bcm2835 library, and execute the command: //