The world of IoT and cellular connectivity is full of complex features, uses, and industry-specific jargon. Today we want to introduce and explain everything behind the term "AT commands" and how these commands can simplify communication with your cellular module.
"Attention Commands" (AT commands) are simple commands used to control and configure IoT devices. These commands can be sent to the device via a serial port, text, or a connectivity management platform (like 1oT Terminal). They can be used to change device settings, get a status update, reboot the device, and perform other functions.
One of the main advantages of using AT commands is that they are supported by many IoT devices. Consider AT commands as a powerful tool for communicating with and controlling IoT modules, as they provide a simple and easy-to-use interface for interacting with the device and can be used in a variety of applications.
AT commands are useful in several cases:
AT commands are very popular when device troubleshooting is required.
Let’s now go through some of the most frequently used commands with Quectel EC25 as an example.
For IoT devices, one of the most important steps to fix a problem is to reboot the device. This will solve most of the problems related to the device.
To restart the Quectel EC25 cellular module, you can use the AT+CFUN command.
Note: Please note that a value of "1" means full functionality, while a value of "0" means minimum functionality. You can restart the device by setting the functionality to minimum and then back to full.
Roaming services are essential in IoT modules as they allow devices to seamlessly connect to different networks when they move between geographic locations.
AT command to enable roaming services on the Quectel EC25 module is AT+QCFG="roamservice",1
Note: It should be noted that this command is used to configure the roaming service status. It does not configure the roaming network itself. The device may need additional configurations like a proper APN and credentials for the roaming network. Also, the device must be registered to the network before enabling roaming.
AT commands can also improve overall performance and reliability and ensure that the device is connected to the best available network. This can be done by manually selecting the best available network, setting the device to automatic network selection, or getting the list of available networks.
The following AT commands can be used for automatic/manual network selection and checking the available network operators in Quectel EC25;
Note: It's important to note that the exact options available and the format of the AT+COPS command may vary depending on the modem's firmware version and the network's specific requirements. It is recommended to consult the modem's firmware manual or the manufacturer's website for more detailed information on the correct AT command syntax for your specific use case.
Regularly checking the status of the IoT module can ensure that it is functioning properly and resolve any issues that may arise.
The response to the first command will be in the following format:
+CREG: <n>, <stat>
Where <n> is the status reporting mode (0, 1, or 2) and <stat> is the registration status:
To send the AT command from the 1oT Terminal, type the command in the text box and click send. Visual shared below for assistance.
In summary, the AT commands have proven useful when you need to check your devices remotely. They are useful for setting up or configuring the device by simply sending a text message. The AT commands mentioned above are the most commonly used commands.
If you have any further questions about this topic or have difficulty understanding your own device's AT commands, please feel free to contact us at support@1oT.com.