possible with /fetch cli command: /tool fetch mode=https url="https://api.telegram.org/bot{BOT_TOKEN}/sendMessage" http-method=post http-data="chat_id={CHANNEL_ID}&text={MESSAGE_STRING}" example with fake data: /tool fetch mode=https url="https://api.telegram.org/bot1006...

i noticed my LTE6 modem always connects to just 1 (highest) band at start, but later at download/stress it connects to 2nd. Dont know how exactly CA works, but maybe some BTS drops idle connections to don't hold resources?

also face stability problems with my new R11e-LTE6, in my case whole modem randomly hang, "AT+RESET" cmd from your post helped for now
signal is perfect, because im <50m from BTS

can confirm rekeying is broken in 6.45.1stable, the only solution to don't drop connection is to set PFS Group to: none, in IPsec proposal