write hangs on generic command

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#64 write hangs on generic command

Milestone: v1.0 (example)

Status: closed

Owner: Chris Liechti

Labels: None

Priority: 9

Updated: 2015-08-05

Created: 2014-07-26

Creator: rangewookie

Private: No

I start by opening a serial port with no settings (the device doesn't require configuration, it's usb).

serPort = serial.Serial("COM13", timeout=1)

I can send this command without a problem (runs correctly)...

serPort.write("relay on 0" + "\r\n")

But when I send this command, the write hangs and the command is never sent...

serPort.write("relay writeall 80000000" + "\r\n")

What could be causing this? It's just a string... The only visible difference is that the string is longer.

Discussion

Chris Liechti - 2014-07-31

Ticket moved from /p/pyserial/bugs/165/

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Chris Liechti - 2014-07-31

difficult to guess. is it a micro controller board with USB-serial emulation? maybe that blocks on long or multiple packets.

does it work with terminal applications (pySerial's miniterm or any other "real" terminal application)?

maybe a monitoring of the serial port or USB traffic could give some insight where it hangs.

there might be driver issues, depending on the type of serial port emulation (CDC/ACM, custom protocols) and the operating system. => which operating system do you use and what driver type (CDC, other)?
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Chris Liechti - 2014-07-31

status: open --> pending

assigned_to: Chris Liechti

Group: v2.7 --> v1.0 (example)
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Chris Liechti - 2015-08-05

Status: pending --> closed
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