How to check where the user sent the message from, from a PM or a conversation?

Question

In contact with

I need to check where the message from the LAN or conversation came from.
I use longpool
Thanks in advance)

Answer 1

if the peer_id field is more than two billion, then from the conversation

Answer 2

peer_id = 2000000000 + conversation id. - that's a conversation. If equal to user ID, then private messages