A lot of NACKs

[mpp]

The following code results in a st=NACK for send msg2 and msg3:

send(msg1);
send(msg2);
send(msg3);

This results in a st=OK for all

send(msg1);
wait(LONG_WAIT);
send(msg2);
wait(LONG_WAIT);
send(msg3);

A power issue perhaps?

[mfalkvidd]

@mpp yes this is a common problem. Adding delays seems to be the most popular solution but a more stable power supply might be good as well.

[mpp]

Unfortunately adding delays will cost battery. I'll do some testing with different power supplies.

[mfalkvidd]

@mpp or skip the power supply and run directly off the batteries

[mpp]

that's the idea yes. But the thing is, I'm seeing these messages through the serial interface when USB powered. Not sure what to expect when I power the node from the battery.

[mfalkvidd]

@mpp disconnect Vcc from the usb and run the node from batteries while looking at the serial output maybe?

[mpp]

Thx for the tip. Only vcc or vcc and ground? Wouldn't want to damage my laptop...

[mfalkvidd]

@mpp ground needs to be connected, otherwise the signal levels for the serial won't match.