Send a message to the Team Channel from the custom Teams Tab that I developed

Question

I'm building a custom Teams tab app.

It should perform some simple tasks (retrieve some content from some URL) and then send a message to the Channel in which it's added (just like when a user writes a message in the Posts section.

Can somebody please point me to the initial steps for this ? Some introductory documentation, some code sample ?
I can't seem to find the starting point...

Thank you.

Answer 1

Adding answer from comment section for more visibility:

@Serban - You can send proactive messages while installing/adding bot in Teams channel.
Reference Docs:
https://learn.microsoft.com/en-us/microsoftteams/platform/bots/how-to/conversations/send-proactive-messages?tabs=dotnet

https://github.com/OfficeDev/Microsoft-Teams-Samples/tree/main/samples/graph-proactive-installation/csharp

You can also use Graph API to send message in channel based on your requirement:
https://learn.microsoft.com/en-us/graph/api/chatmessage-post?view=graph-rest-1.0&tabs=http

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