How to request undelivered messages in BotFramework? - botframework

I can send a message to Skype user and I can receive message from him. But I can't get messages that user sent to bot while server is down.
For example, Facebook Messenger Platform will resend the webhook event every 20 seconds, until a 200 OK response is received. Viber also used webhook url. But Skype does not resend to my bot at least 15 minuts.
I realized a simple Echo Bot. The bot messaging endpoint isn't Azure. The bot is not published, but can be added to Skype contacts. I use REST API.
Any help is welcome. Sorry for my bad English

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Up until this Friday, MS Teams would always send a conversationUpdate event payload to our bot messaging endpoint whenever a user installed our app in Teams.
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Given that: how do we know to send a Welcome message via our bot to a user that installed our app if we receive no message, no payload. Nothing hits our bot messaging endpoint.

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I set up an app using the App Studio within Teams and enabled a bot.
I set up the Messaging endpoint for the bot and am able to receive message and conversationUpdate events from the Teams client. This all works fine.
However, if I then edit a message in the Teams client, the messaging endpoint does not receive the text of the edited message at the messaging endpoint.
Similarly, if I delete a message, I do not receive an event indicating that a message has been deleted.
I'm wondering:
Is this expected behavior?
Is there somewhere these events have to be configured in order to receive them?
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Thanks!

How to get a welcome message on teams even before user sends any message

I have deployed my bot on teams channel.
I would like to send a welcome message to a new user even before user sends a message to the bot.
can we achieve this for teams channel?
If yes, which event can be used to get that user is accessing bot for the first time.
You can use the ConversationUpdate event ActivityTypes.ConversationUpdate // in c#
When a bot is installed, your bot receives a conversationUpdate event. You can then send a proactive message to the user. Could you please try sending a proactive message and let us know if you face any issues?
The conversationUpdate event with the membersAdded object in the payload is sent when either a bot is added to a team or a new user is added to a team where a bot has been added. It is always a good practice to send a welcome message introducing the bot to all the users. Ensure that your bot responds to the conversationUpdate message, with the teamsAddMembers eventType in the channelData object. Also, keep in mind that the memberAdded ID is the bot's App ID itself, because the same event is sent when a user is added to a team.
Hope this helps.

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