USB Read Timeout Issues on Raspberry Pi

[inancme]

When the project is run on Raspberry Pi unfortunately there are timeouts while reading from the USB. There is a hack that involves magic numbers and adding timeout to the read and sleep when the buffer size exceeds a certain size. The hack was found on stackoverflow belongs to Jordan Grider (thanks) and it works fine. However should be improved before being committed. It looks like this:

def read_packet(self):
    try:
       res = self.dev.read(self.read_endpoint, self.usb_packetlength, 1000)
       if (len(res)>10000):
           sleep(1)
       return res
    except ...

[iwanders]

Hmm, sounds like a hack to work around sketchy USB drivers, can you link the stackoverflow answer? I wonder how this protects against the timeouts...

We can maybe incorporate this behind a command line argument or environment flag or something. I don't want to degrade performance for normal USB stacks... but given that the RPi has a large user base and is low power I can definitely see it being used in combination with the gps tracker.

[inancme]

Here is the stackoverflow link: https://stackoverflow.com/questions/54313817/python-usb-read-timeout-issues-on-raspberry-pi