I am able to communicate between a coordinator and two routers using API2, but have run into some difficulties which is some circumstances a single packet transmission by 64 bit address from the coordinator to one router causes the other XBee router to start an endless stream of packet transmissions. The Knowledge base that I have just read suggests that I should not be using API2 but should use API1. I have tried resetting all three XBees to API1 by changing the AP setting. On doing so the coordinator can receive messages from the routers, but the routers no longer receive from the coordinator.
Are there any other settings that need to be changed to make API1 work?
Do you have any thoughts on the problem in API2 mode?