[Twisted-Python] Serial port communication
dmarfil at citic.es
Tue Mar 25 07:45:25 EDT 2008
Hi, I'm trying to send some commands to a modem connected to the serial
port, in a sequential way.
I can send the first command to the modem but I must wait for the whole
response before sending the next command. I haven't got much experience
with Twisted so I'm not sure about the best protocol I can use for this.
At this moment I'm trying with SerialPort (from
twisted.internet.serialport) as my factory, and LineReceiver (from
twisted.protocols.basic) as its protocol.
I can write to the serial port with the SerialPort's method
writeSomeData and it works fine, but the modem returns the response byte
to byte, so the dataReceived method (in the LineReceiver protocol) is
launched with every byte received, so I have to store the bytes in a
string so I can find the end of the response and then I can see the
So I can get the whole response from the modem, but in that moment I
don't know how to tell the factory that it can send another
writeSomeData (remember that it must be done in a sequential way).
So the question is: how can I tell the factory that it can run another
writeSomeData once I got the right response from the modem?
I know that the main problem is my inexperience with Twisted, so I'm
sure there's a better way to implement this. Maybe a more appropiate
Any clue will be very welcome ;-)
Thanks in advance,
More information about the Twisted-Python