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Python: separate variables after sending through TCP.

wallarug

I have set-up a python TCP server and client.  I send the data using the following commands:

[code]

def send2screen(motor_a,motor_b):

    byte4 = chr(int(motor_a))

    byte5 = chr(int(motor_b))

    sock2.sendall(byte4+byte5)

 

< Other stuff goes here >

 

send2screen(motor_a,motor_b)

 

[/code]

 

When the data gets to the Server, I want to be able to separate the two variables motor_a and motor_b.  The two variables hold a value that is constantly changing between 0 - 255 for each variable. eg. Motor_a = 64, motor_b = 117

 

Is there anyway that I can separate this information?

 

This is where the data will need to end up:

[code]

lcd.clear()

   ipaddr = run_cmd(cmd)

   lcd.message('A = ' +int(motor_a) ' | B = ' +int(motor_b) '/n')

   lcd.message('IP %s' % ( ipaddr ) )

 

[/code]

 

Any help will be necessary.

Parents

  • I still have not completed this and would still like help from anyone who knows what they are doing.

  • in reply to wallarug

    Hi Fergus,

    I'm a python newbie like you, but I decided that I needed to know how to solve your problem, so I did some research to arrive at the code that follows. I hope

    that it helps you.

    #--------------------------

    motor_a= 66

    motor_b= 117  # for example...

    Send_String=str(motor_a)+"    "+str(motor_b)     # make a string to send,using 3 spaces to separate the 2 values

                                                                          # 

    print "the send-string is ("+Send_String+")"

    # Send the string.

    #==========================================

    Received_string=Send_String

    #==========================================

    #At the receiving side, decode

    # the motor values by :....   

     

    motor_a=int(Received_string[:4]) 

    motor_b=int(Received_string[5:])

     

    print"motor_a= "+str(motor_a)

    print"motor_b= "+str(motor_b)

  • in reply to mgt6910

    Malcolm Turner wrote:

     

    Hi Fergus,

    I'm a python newbie like you, but I decided that I needed to know how to solve your problem, so I did some research to arrive at the code that follows. I hope

    that it helps you.

    #--------------------------

    motor_a= 66

    motor_b= 117  # for example...

    Send_String=str(motor_a)+"    "+str(motor_b)     # make a string to send,using 3 spaces to separate the 2 values

                                                                          # 

    print "the send-string is ("+Send_String+")"

    # Send the string.

    #==========================================

    Received_string=Send_String

    #==========================================

    #At the receiving side, decode

    # the motor values by :....   

     

    motor_a=int(Received_string[:4]) 

    motor_b=int(Received_string[5:])

     

    print"motor_a= "+str(motor_a)

    print"motor_b= "+str(motor_b)

    Could you please include a full sample of python script please?

  • in reply to wallarug

    a='x'

    b='y'

    c=a+b

    d=c[0]

    e=c[1]

    print d

    print e

     

    output:

    x

    y

  • in reply to Former Member

    That doesn't work on the other side of the connection.  I get the information buffering and then when I ask it to print on my LCD display, it just prints out too many digits to fit on the screen instead of the latest value recieved.

  • in reply to mgt6910

    Hi Fergus, I'm not the person to advise you on socket-programmimg, but I tested my script

    with ranges of values, and it solves the character-handling part.

     

    Good luck with this project.

     

    Malcolm

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