Telegram bot stops receiving update events from the server, if bot has been running for a long time

[zamazan4ik]

Hi!

I've wrote one telegram bot: https://github.com/ZaMaZaN4iK/codedetection-telegram/blob/master/src/main.rs

I've found one issue: if the bot wasn't triggered a long time (like several days), bot doesn't receive messages from Telegram server anymore. Restarting helps.

I've the same issue in C++ library for Telegram - tgbot-cpp. Also you can find the same issues in other libraries for Telegram.

For fixing it you should tweak connection to the Telegram server.