Question On call backs

[germacovitch]

Hi there
Is it save tô assume that a call back will not occure in berween a function that you call in the loop block of code?
BR
Gilberto

[256dpi]

The callback is usually called as part of client.yield(). However, if you call client.subscribe(), client.unsubscribe() or client.publish() // with qos > 0 it might get called as well, if messages are received while waiting for the acknowledgement.

[germacovitch]

Thanks
How can I protect some part of my code from being interrupted by a callback? Is it possible?
BR
Gilberto

[256dpi]

In other projects I used a queue to push messages in from the callback. That way you can process them at another point in your program. I don't know if there is a suitable queue implementation for Arduino.