Android Question handling multiport

one more question, is it possible to use an android device as a server and a client simultaneously? (by using Network library)
to be more clear, I want my android device work in two modes because
1-(as client) send some information to my php file in sever(in which it sends to some other clients after some processing)
2-(as server) to be sure that all those ones get my messages( knowing who get my messages and who don't)
please consult me
many thanks

Twp examples:
[B4X] FTP Server implemented with Socket and AsyncStreams
MJPEG / CCTV Server

With that said, it is a mistake in most cases. Use MQTT and everything will be simple.

Thank you, Erel especially for answering fast.
did I get right? did you mean using MQTT for making possible client and server at the same time?

MQTT makes it very simple to implement communication between multiple devices. It is not really a server to client connection but rather clients to clients with very good control on everything.

Erel said:

MQTT makes it very simple to implement communication between multiple devices. It is not really a server to client connection but rather clients to clients with very good control on everything.

Click to expand...

Thanks a lot
I understood MQTT is the solution of remote client to client connections but as I implemented based on socket it's hard for me to change. I got an idea asking your opinion.
I would be grateful to you.
As we know the problem of connection between two clients which are not in the same network is that it's hard for us to find their IP address. what if we put their IP address in online database and tell both sides to give their new IP address to server every couple of hours? It's not the answer lonely because IP address may change just after sent to database by turning modem off/on, for example. Therefore, we need a check code to make sure if the destination client got the order or not, then we check the IP address again. logical code is like this:

while( you have IP address of destination)
send stuff to destination
if not(check code) then
get IP address from database
else
return true
end if
loop

mohammad javad said:

As we know the problem of connection between two clients which are not in the same network is that it's hard for us to find their IP address

Click to expand...

How is this related to this thread?

Connecting two clients on different networks requires more than finding the ip address. See this tutorial: https://www.b4x.com/android/forum/threads/37201/#content