You can test the below AT commands with Online AT Command tester. However this approach locks the solution to the manufacturer’s interface which makes it difficult to switch to a different vendor in the future. Software APIs are more programmer-friendly than AT commands and generally offer more capabilities. Though AT commands are primary interface to the modules, module vendors also provide software Application Programming Interface (API) support for their modules. Some examples of extended capabilities are FTP (File Transfer Protocol), HTTP for web access etc. Some of the AT commands defined in the specification are optional.Īpart from the the AT commands defined in the 3GPP specification, module manufacturers also provide extended AT commands that are specific to thier modules. That implies that all the wireless modules that operate on cellular networks are required to support AT commands.ĪT commands provides interface to interact with the module to perform variety of tasks such as getting device/manufacturer information, send/receive phone calls, initiate data calls, access the SIM information that is attached to the module, get network information such as signal strength, registration status, network speed etc. AT commands are defined as part of 3GPP standard under 3GPP TS 27.007. AT commands are software interface for wireless modules.
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