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Hi, we have a FMM640 tracer device. With 2G, we can send data without any problems, but we want to send data via 4G. We are having problems using 4G. "Socket" state is constantly "closed" and what could be causing this? As I said before, there is no problem sending data with 2G. Do you have a suggestion?

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Hello there,

Good day. Thank you for your question.

We would like to analyze your issue. Please reach out to us via VIP Helpdesk or contact your sales manager/distributor. If you don't have any contacts with our Sales managers, please contact them on our official website and click on the "Contact Us" button. When you will click, please fill the form and submit it.

Note: as a topic, please choose "Vehicle telematics" or you can send an e-mail with the description of your situation to [email protected]

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Kind regards.

Any proceedings on this issue?

We also have an FMM640 that works perfectly on 2G. However, no success with using it on 4G. I've tried all possible combinations in Network Settings. If I use "Auto", the device falls back to 2G. If I force 4G (with any network modes or band selection), the device simply cannot go online.
The SIM card is OK, it uses 4G if we put it in a phone.

Firmware 00.03.74.T112.

When I try to make Dump in Teltonika.Configurator (1.7.4 B.FM64 R.12) it gives the following error message:
"Response Id from device does not match with expected response Id. Receive response - FileManagementRequestResponse, expected response(s) - Ack"