How to create a socket_open to UR5 to read coordinates send by a PC

Tr1peiro 2022-06-03

I was wondering if you cold help me in a proggram for the robot UR5, because I have been struggling in the creation of a socket/TCP that can run in the robot but at the same time can read the coordinates that have been sent by the computer.

I have already the code for user/server already created but, the client program(URrobot) i can make a program that cand read this coordinates and I have already tried to use the scripts socket_read_interger and the socket_read_ascii_float and none of them work

matthewd92 2022-06-03

When the server receives the read request what is it returning the to the robot and how is the data wrapped? What is an example of the return value the server is sending?

Tr1peiro 2022-06-03

matthewd92 said:

When the server receives the read request what is it returning the to the robot and how is the data wrapped? What is an example of the return value the server is sending?

the code i use on the robot is the following down

def test2():
    flag = False
    sync_flag = False

    open = False
    while(open == False):
        open = socket_open("192.168.1.6",5050)
    end

    # popup("Connected to server!")
    while (sync_flag != True):
        data = socket_read_ascii_float(6)
        if (data[1] == 1):
            flag = True
        end
    end
    socket_close()
    flag = False

end
test2()

but he can't read the information i send in the PC to the interface's robot.

matthewd92 2022-06-03

What is an example of the return from the PC server? If its not configured correctly the robot will not receive it. That is why I asked to see the return value

Tr1peiro 2022-06-03

matthewd92 said:

What is an example of the return from the PC server? If its not configured correctly the robot will not receive it. That is why I asked to see the return value

The code on pc server is write in that way:

"import socket
from struct import pack

#Variaveis
S = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
IP = "192.168.1.6"
PORTA = 5050
FORMAT = "utf-8"

server_address = (IP, PORTA)
S.bind(server_address)
S.listen(5)

connection, client_address = S.accept()
val = pack('i!', 4)

#Escolha das coordenadas
waypoint1 = input('Inserir coordenadas: ' + "\n")
waypoint2 = input('Inserir coordenadas: ' + "\n")
waypoint3 = input('Inserir coordenadas: ' + "\n")
waypoint4 = input('Inserir coordenadas: ' + "\n")
Ligar = input('Enviar coordenadas e ligaar Servidor? ')

#Decidir se conecto ao servidor ou não
if Ligar == ('yes' or 'Y'):
   connection.send(val)
   S.send(waypoint1.encode())
   S.send(waypoint2.encode())
   S.send(waypoint3.encode())
   S.send(waypoint4.encode())

elif Ligar == ('no' or 'N'):
    connection.close()

else:
    print("tenta outra vez")

connection.close()"

matthewd92 2022-06-03

Also, you are stuck in an endless loop on your robot code, you are performing a while loop against `sync_flag` but you are setting the value for `flag` in your logic if a value is returned. Also are you also always sending the first value of the data back from the server as `1`? A better check to know if data was received is to query index 0 in the array, if the value is `6` then you have gotten back the volume of data that you expected, if it's anything other than 6 you are not getting back the data you requested. If you put the `global` identifier in front of the `data` variable you would be able to see that on the teach pendant in the variables list and you could therefore see what the data variable is holding.

Remember the data variable will be an array of length = 7, you are requesting 6 values which will be indices 1 to 6 and the robot will place the size of the resulting read in index 0, if the read fails you will get a 0 in that position, otherwise it will be the number of values that were returned.

matthewd92 2022-06-03

Have you tried using a socket test program to send the request and see what value that server returns. Also, the robot has a timeout of 2 seconds on the read value so if you are waiting for the robot to send a request and then typing the values back you are probably timing out on the robot read

Tr1peiro 2022-06-03

matthewd92 said:

Have you tried using a socket test program to send the request and see what value that server returns. Also, the robot has a timeout of 2 seconds on the read value so if you are waiting for the robot to send a request and then typing the values back you are probably timing out on the robot read

I also test in SocketTest and sending the coordinates and work fine....

My big trouble now is how i write the socket to connect the machine to the PC.....

In the first time i create one simple code without the while loop but this code doesn't work.....

# def prog():
#     open = socket_open("192.168.1.7", 5050)
#     movel(Plane_1, accel_mss, speed_ms, 0,0)
#     sendToServer = 'Coordenadas: '
#     socket_send_string(sendToServer)
#     data_1 = socket_read_byte_list(8)
#     if data[0]=8
# prog()

matthewd92 2022-06-03

What does the return value that you get in socket test look like? Can you send an example of what the server is sending to the request?

matthewd92 2022-06-03

This is an example test socket that I created years ago to test some camera connection. You can see here how the return is formatted, this is the required format per the UR documentation. We read this as a string and then decoded it on the robot side since we wanted a mix of string and floats.

print("Program Start")

tel = 0

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)