How can a Telegram Bot figure out that user has opened the chat window?
问题 How can a bot send a message to the user, when user just opens the chat. Example: User has already added a Telegram bot to his list of contacts and started conversation Later on, user opens the chat window with that bot Bot "sees" that user has opened the chat window, but hasn't written anything yet Bot should say "hello, what can I help you with?" to the user Is there any event/trigger for a step #3 in Telegram Bot API? 回答1: No. There is no trigger for each time user opens the chat window