*** Network ***

4-way communication (8-pathway)

11 <-          ---21---
         \       /             \
           ---                 ---> 31
         /      \              /
12 <-          ---22---
	
	

Node 11 sends a '2' message to node 31 about every 0.2sec.
(LED2 of node 31 toggles.)

Node 12 sends a '3' message to node 31 about every 0.2sec.
(LED3 of node 31 toggles.)

Node 21,22 works just as a router.
(It doesn't matter if one of them is turned off.)

Node 31 sends '2' messages to node 11 in order about every 0.2sec.
(LED2 of node 11 toggles.)
Node 31 sends '3' messages to node 12 in order about about 0.2sec.
(LED3 of node 12 toggles.)


*Note 1 : 
The periodic time may be longer than expected because of execution time of interrupt.

*Note 2 :
If the data rate is high, the recieved data may be accumulated in the queue.
So when RX thread works, several data may be received at the same time. 

*Note 3 :
Turning on/off sensors or routers, it takes time to find a route to communicate with.
Just wait for a second.

