How to send message followed by start to a bot by link using telethon?

Question

I want to interact with a bot which takes chat id and message id and replies based on the message of that chat id.

Usually I interact with the bot in a group chat using KeyboardButtonUrl having link (e.g. here is that url behind KeyboardButtonUrl, https://t.me/SomeBot?start=-1001234567890_654321) to the bot with data. I click on the button which directly opens the chat with bot & clicking on Start button, sends the command to the bot (I think bot fetches the message from the passed data having chat id and message id) .

Sending message '-1001234567890_654321' using send_message function doesn't work as expected. How can I achieve this using telethon ?

Also After searching in telethon docs, I could not find any function which returns a particular message after taking message id and chat id. get_messages & iter_messages returns specified no. of last msgs only.

Answer 1

You can use @oleskii's approach, but you can also just send a message like so:

client.send_message('bot username', '/start params_string')

Answer 2

it looks like you want to start a bot with parameters.

Please refer to the following: https://tl.telethon.dev/methods/messages/start_bot.html

You can make it work tunning this example to your needs:

from telethon.tl.functions.messages import StartBotRequest

request = StartBotRequest("bot_username_bot", "bot_username_bot", "params_string")
result = await client(request)

The request will work the same way like the following link would work:

https://t.me/bot_username_bot?start=params_string

Hope that helps! Good luck!

Answer 3

I could not find any function which returns a particular message after taking message id and chat id

client get_messages method gives an ids argument that specify message id or list of ids.

message = await client.get_messages(chat_id, ids=message_id)

return message object if given id exists or return None

---

ids = [message_id_1, message_id_2, message_id_3, ...]

messages = await client.get_messages(chat_id, ids=ids)

return total list of message objects with given id list. list item will be None if id does not exists.

see the get_messages documentation here