how to communicate two node through third node only??

i want to communicate two node through third node say router. i want to increase range of two node so there must a third node which can receive data from one node and transmit to second node.
how should i configure these all three node in xctu …
let me know configuration mode and how to set its addresses

You can’t force a particular route. Routing is very low-level network functionality that not exposed via the XBee’s serial API.

If you want to increase range simply place a third node in between the original two nodes. Set all of your addressing ignoring the third node. The network stack will automatically route through the third node as an intermediary if/when necessary.