I managed to manually send msgs to telegram using rest API, but seems to be not an automated process (sure I know very little of rest API).
I was able to set up a flespi stream (of type http) and get a (fixed for now) message sent to a telegram user/channel using the bot api sendMessage. Thus each time the device receives a msg the stream sends a (fixed) msg to telegram.
Would be very useful if a calculator could subscribe to a stream and not only a channel or device: in this way the destination application could benefit of the calculations of flespi platform. But seems it is not possible: am I wrong? Or is it possible?