Console.print(ln): when does this return?

Hardware Arduino Yún
1

Two questions:

If I have my IDE not open, and hence the Serial Monitor not open, where do all the Console writes go to?

When does Console.print return? Suppose the wifi is down for a while, could this mean Console.print would block in some way?

2

My experience is, that if nothing is connected to that USB, the write buffer fills up and a next write call blocks forever (what else could it do?)

kind regards,

Jos

3

I thought console was over wifi, not USB?

I am not experiencing that it blocks forever.

4

I must've misundersttood: if you print to the Serial stream, you're effectively printing to the USB bus; if nothing is connected at'the other end', such as a serial monitorr from your ide, then the buffer fills up etc.

kind regards,

Jos

5

I am using Console, not Serial. I am quite sure the write does not block. E.g. I can run my sketch with lots of Console.print for a long time without the serial monitor. But we are being sidetracked, I am especially interested in my question 2., i.e. if Console.print behaviour (especially how fast it returns) can be influenced by wifi connectivity issues.

6

I'm not using the bridge stuff (I dumped it) but after reading the (python) source code, all it does is read and write from/to /dev/ttyATH0 and send/receive stuff to/from a client socket. The python 'middle man' set up a server socket on port 6571 for the purpose. If your WiFi connection is bad, it can take quite some time for a read/write to complete ... sorry, I can't be of more help here.

kind regards,

Jos

7

Thanks, this is useful. I am trying to debug something really weird, looking as if something in my sketch is taking abnormally long. This would be my first suspect.

8

Normally, ahem, those suspicous opertations are easy to pinpoint, i.e.

unsigned long start= micros(); // or even millis()
// suspcious operation here ...
unsigned long end= micros();

if end-start is 'too long to be true' narrow down the suspicious operation until you have found the nasty rascal.

kind regards,

Jos