Impatiently waiting for the very same signal information. That was available with older images (for RUT 230 and 240), where I was able to extract it from the login page using Python and bs4. Why was that information now deemed unnecessary?
Of course, this signal level information could be available in an even easier way, than by forced html parsing. A better way to give this information would be a number as a response to GET query, like http://192.168.1.1?signal or something like this.
So far Teltonika has put most of the interfacing related development effort on GUI, used by humans. But the routers are not approached by humans after the connectivity provisioning any more. From that point on the users are other devices, needing the connectivity and related information - the simpler, the better.