13. IPC Pingpong!

This example is to illustrate the usage of RIOTs IPC messaging system.

The application starts a second thread (in addition to the main thread) and sends messages between these two threads. The main thread calls thread_send_receive() in an endless loop. The second thread receives the message, prints 2nd: got msg from x to stdout and sends a reply message with an incrementing number back to the main thread. The main thread then prints the number it received from the 2nd thread.

The correct output should look like this:

This is RIOT! (Version: xxx)
kernel_init(): jumping into first task...
Starting IPC Ping-pong example...
1st thread started, pid: 1
2nd thread started, pid: 2
2nd: Got msg from 1
1st: Got msg with content 2
2nd: Got msg from 1
1st: Got msg with content 3
2nd: Got msg from 1
1st: Got msg with content 4
2nd: Got msg from 1
1st: Got msg with content 5
2nd: Got msg from 1
1st: Got msg with content 6
2nd: Got msg from 1
1st: Got msg with content 7
2nd: Got msg from 1
1st: Got msg with content 8
2nd: Got msg from 1
1st: Got msg with content 9
2nd: Got msg from 1
1st: Got msg with content 10
[...]