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POTwisted serialport dataReceived() provides fragmented data
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  1. POTwisted serialport dataReceived() provides fragmented data
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    copied!<p>I am tyring to implement a python program, using Twisted, to communicate witha bluetooth device. The following is a sample code of what I have implemented:</p> <pre><code>from twisted.internet import protocol, reactor from twisted.internet.serialport import SerialPort from 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 to 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() </code></pre> <p>When I run the program, sometimes I get a response and other times I do not receive anything. And most of the times long responses are fragmented appear as part of the next message. I have through the hyperterminal to make sure that I get the appropriate response from by bluetooth device. So, the problem has to be with my code.</p> <p>Is there something that I doing wrong in my code?</p> <hr> <p><strong>Additional modification/correction</strong></p> <p>When I replace dataReceived() function in the above code by stringReceived(), the program never enters this function.</p> <p>I also tried to above program with the LineReceiver protocol, as the following:</p> <pre><code>from twisted.internet import protocol, reactor from twisted.internet.serialport import SerialPort from 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 to 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() </code></pre> <p>I have the same problem, as before, with fragmented data from the dataReceived function.</p>
 

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