the rtt-target implementation is light on compiler fences so the compiler could
be doing unwanted reordering of memory operations. At least patch up a place
where these orderings may result in an observable change of behavior
and adjust puzzle-radio starter code accordingly
this reduces the chance of people using puzzle-radio with the wrong dongle
app (i.e. loopback); that would lead to them getting response different than
what's indicated in the text
I have also added the app name to the dongle / serial-term output:
``` text
deviceid=75fa82ad7588b3c7 channel=20 TxPower=+8dBm app=loopback.hex
```
