Help with ACK ..

[dzairo]

Hi all.
Long time ago use 1.4 version of MySensors and make small sketch that every time send packet to gateway and wait for ACK . if ACK received then generate short beep , if not received then generate 2x long beep .
All working ..

but now return back to my project and use 1.5 version of MySensors and compile program with latest version of MySensors .. and have problem to receiving ACK ..

then is there any sketch for latest version MySensors what do same think like my previouse code???

I have two node : 1. old firmware (all work )
2. new one and still beep so ACK not received ..

what is change between 1.4 and 1.5 ???

regards..