Hello! I am having issues with the connection between Teltonika RUT955, firmware version * RUT9XX_R_00.06.09.5 and product code RUT955H7VXXX, and Azure IoT Hub. At first I tried to make a test connection in the Services > Iot Platforms > Azure IoTHub with some GSM values, but nothing. I tried to add more Root CA Certificates, because i thought this was the issue, but it didn’t worked. Now i tried to send data from a Modbus TCP slave thru Modbus Data to Server, filled every configuration setting, but it didn’t worked. I tried to verify if the firewall or the port is blocked and I got this error in the cli:
root@Teltonika-RUT955:~# telnet Tehno.azure-devices.net 8883
Connection closed by foreign host
I think that the messages are sent to Azure, but they block them.
Also, I tried to send data to other IoT Cloud Platforms and I succeeded.
Please, can you help me solve this problem or at least have an answer.
Thank you!
Hello,
Thank you for reaching out.
First, if you haven’t already, I would recommend reviewing our dedicated Azure IoT Hub connection guide on the wiki that might offer some valuable insights that could help in your case.
Additionally, could you please check whether the router can successfully resolve and reach the Azure endpoint? You can check this directly from the router CLI by running
ping your-hub-name.azure-devices.net
nslookup your-hub-name.azure-devices.net
Looking forward to your feedback.
Best regards,
Hello,
Thank you for your response.
Yes, I initially followed the Azure IoT Hub connection guide you mentioned, but unfortunately I didn’t get any results. I also verified that the router can resolve and reach the Azure endpoint — both ping and nslookup commands return valid responses.
The issue is that, although the configuration I applied matches the one in the tutorial, no messages are received in the Azure IoT Hub. I’ve also confirmed that the connection works fine with other IoT cloud platforms, which makes me think the problem might be related to the way Azure is handling or expecting the messages.
If you have any additional suggestions or ways to debug this further, I would really appreciate it.
Thank you!