python - Twisted serialport dataReceived() provides fragmented data -


i tyring implement python program, using twisted, communicate witha bluetooth device. following sample code of have implemented:

from twisted.internet import protocol, reactor twisted.internet.serialport import serialport twisted.protocols import basic  class devicebluetooth(basic.int16stringreceiver):      def connectionmade(self):         print 'connection made!'         self.sendstring('[01] help\n')      def datareceived(self, data):         print"response: {0}".format(data)          print "-----"         print "choose message send: "         print "1. stim on"         print "2. stim off"         print "3. stim status"         print "4. help"         # user input         ch = input("choose command :: ")         if int(ch) == 1:             self.sendstring('[02] stim on\n')         elif int(ch) == 2:             self.sendstring('[03] stim off\n')         elif int(ch) == 3:             self.sendstring('[04] stim ?\n')         elif int(ch) == 4:             self.sendstring('[05] help\n')         else:             reactor.stop()  serialport(devicebluetooth(), 'com20', reactor, baudrate=115200) reactor.run()

when run program, response , other times not receive anything. , of times long responses fragmented appear part of next message. have through hyperterminal make sure appropriate response bluetooth device. so, problem has code.

is there doing wrong in code?

additional modification/correction

when replace datareceived() function in above code stringreceived(), program never enters function.

i tried above program linereceiver protocol, following:

from twisted.internet import protocol, reactor twisted.internet.serialport import serialport twisted.protocols import basic  class devicebluetooth(basic.linereceiver):      def connectionmade(self):         print 'connection made!'         self.sendline('[01] help')      def datareceived(self, data):         print"response: {0}".format(data)          print "-----"         print "choose message send: "         print "1. stim on"         print "2. stim off"         print "3. stim status"         print "4. help"         # user input         ch = input("choose command :: ")         if int(ch) == 1:             self.sendline('[02] stim on')         elif int(ch) == 2:             self.sendline('[03] stim off')         elif int(ch) == 3:             self.sendline('[04] stim ?')         elif int(ch) == 4:             self.sendline('[05] help')         else:             reactor.stop()  serialport(devicebluetooth(), 'com20', reactor, baudrate=115200) reactor.run()

i have same problem, before, fragmented data datareceived function.

your protocol subclasses int16stringreceiver implements message framing using 2 byte (16 bit) length prefixes. however, overrides datareceived method implements framing. disables framing , delivers whatever bytes happen read connection - in whatever size happen read.

when subclass int16stringreceiver, you're meant override stringreceived instead.


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