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

[Werner Thie]

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:
>
> op 22-09-14 18:03, Laurens Van Houtven schreef:
>> On 22 Sep 2014, at 17:31, Bram Van Steenlandt<bram at diomedia.be>  wrote:
>>
>>> 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
> 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 ?
>
>
>>> 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 at 4528.
>>
>> hth
>> lvh
>>
>>
>> _______________________________________________
>> Twisted-Python mailing list
>> Twisted-Python at twistedmatrix.com
>> http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
>
>
>
> _______________________________________________
> Twisted-Python mailing list
> Twisted-Python at twistedmatrix.com
> http://twistedmatrix.com/cgi-bin/mailman/listinfo/twisted-python
>