Re: [Twisted-Python] GPRS/Modem protocol through USB support

Aloha maybe you can get some clues from here https://gist.github.com/claws/2464017 which is pretty close to what your looking for. HTH, Werner On 9/22/14 7:34 AM, Bram Van Steenlandt wrote:

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On 22 Sep 2014, at 17:31, Bram Van Steenlandt wrote:

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No specific reason actually, I didn't even know twisted had support for a serial port.

This being said: ftdio_sio can be a bit buggy at times, esp when using multiple devices on the same pc, ftdi on freebsd & osx isn't very stable either. I use this interface selector system where the serial connection can be setup with pyserial,libftdi (which works much better for ftdi adapters) or a tcp socket (which uses a so called "device server" with ethernet and rs232 onboard). Doing it with twisted seems more complicated to me (but I could be wrong), in my case it makes a lot of sense to wait for the data, I poll plc's over rs485 and those kind of things. Use cases vary :-) In a wait-dosomething-wait scenario, I find @inlineCallbacks to typically yield virtually the same code you ended up with.

When I was doing this, there was some pretty complex chatter back and forth, and I was multiplexing several connections over a single RS232 device, so Twisted certainly came in handy. In your case: don’t fix what ain’t broken, of course :) Wouldn't it be difficult to combine the twisted method with external

op 22-09-14 18:03, Laurens Van Houtven schreef: libaries like MinimalModbus, libftdi , libartnet etc ? Or is there some magic that I'm not aware of ? I there a disadvantage to using a thread ?

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Also as I've said, there are sometimes a lot of hardware issues (usb bus resets and stuff, users that disconnect usb-ports and plug them back in) which can be difficult to deal with.

How long does twisted has this serial port support actually ? Well over a decade: Mon Dec 16 04:04:25 2002 to be precise. See svn rev trunk@4528.

hth lvh

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