Socket_send ? str_cat suspend the UR3 program

URCap Development
1

I want to send the text + variable For example: E1 0.9887
I read a variable with a function

if value > 0:
socket_open(“192.168.1.15”, 100, “socket_29999”)

    zmiena = str_cat("E1",value)  ??????????
    

    socket_send_string(zmienna, "socket_29999")  ?????
    
    
    socket_close("socket_29999")
    #stop extruder
else:
  # start extruder
end

Str_cat concatenation not working

socket_send_string(value, “socket_29999”) >>works but how do I add E1 description before valute?