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

[Bram Van Steenlandt]

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
>
>
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