Sending messages to Cloud of Things via AT commands

  • I try to send a MQTT-SN message to the “Cloud of Things”. I have the “NBIOT Protocol Developer Guide” but I don´t know how to send the message via AT commands.

  • Deutsche Telekom IoT

    The communication with CoT works only via MQTT-SN protocol. The details can be found in the developer guide.

    A first simply test can be faked. For this a simple CONNECT-Request is sufficient. This message can be sent to the server (the modul is already attached and a UDP-Socket listens on 1883):


    Then <IMSI> and <PW> should be exchanged by registered IMSI/PW combination (i HEX-String-Format). The Server answeres this with a CONNACK, hence the modul yieldst:


    which in turn with


    can be read.

    Now the module yields :


    The Bytes 030500 represent the CONNACK


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