Need Help with Teltonika FMB920 - Receiving HTTP 400 Bad Request from My Server

Hello Everyone,

I am currently working on setting up my own server to send and receive data from my Teltonika FMB920 device. I have configured a web server on AWS using Nginx, but I am encountering an issue where my server consistently responds with HTTP 400 Bad Request when the FMB920 sends data.

Here are the details of my setup:

Device Model: Teltonika FMB920
Server: AWS EC2 instance
Web Server: Nginx
I have attached a screenshot of the packet capture from my server showing the Bad Request responses:

I would greatly appreciate any guidance or suggestions on the following:

Proper configuration of the Nginx server to accept data from the FMB920.
Examples of successful data communication setups with the FMB920.
Troubleshooting steps to identify why my server is returning 400 Bad Request errors.
Thank you in advance for your help!

Best regards,

Hello @Deniz

Good day, Teltonika FMB device supports AWS IoT Core please find the wiki page link below:
Getting Started with AWS IoT Core - Wiki Knowledge Base | Teltonika GPS (

Best Regards
Maynard C

1 Like

thank you for your answer
i followed this tutorial but i am stuck here

i did not find the JSON CODEC on the configurator , iam using the last firmware update of fmb 920 can you help me ?

here what i found

Hi @Deniz

Please also use the configurator for the base 29 firmware of FMB920 that you are using.

Please download the latest firmware version and configurator here:

Best Regards
Maynard C