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ctrlctrl Posts: 5 Apprentice
Hi I am trying to use C (not python) for RTDE for a UR10e.  Can someone help me figure out how to pack the initial message, which I think should be 'v' for RTDE_GET_URCONTROL_VERSION.  It says two bytes for the package size and 1 byte for the package type.  I can open and connect thru the port but need help getting started with the basic header info in the first message I need to send.  

Can someone break this down for me?  Is this 

 for the header info or am I way off base?  


  • matthewd92matthewd92 Founding Pro, Tactile Sensor Beta Testers Posts: 1,261 Handy
    edited May 2020
    Here is how we did it in nodejs originally, we run new code now but this worked for a long time

    <div>_sendall(cmd, payload = '', callback) {</div><div>    let size = 3; //Header is always 3 bytes long, 2 bytes for the size, 1 byte for the command</div><div>    if (payload.length > 0) size += payload.length;</div><div>    let buf = new Buffer(size);</div><div>    buf.writeUInt16BE(size, 0);        // write the size at index 0</div><div>    buf.writeInt8(cmd, 2);             // write the command at index 2</div><div>    buf.write(payload.toString(), 3);  // write the payload starting at index 3 
        this.sock.write(buf, 'binary', err =>{
    more code here but nothing pertinent to the discussion
  • ctrlctrl Posts: 5 Apprentice
    Thanks, again for the help.  Am I not able to keep connections open to the dashboard (29999), a socket (50000) and another port (30002) at the same time as RTDE (30004)?  

    So far I can send the command out but get no response to RTDE_REQUEST_PROTOCOL_VERSION which is the first command I try to send.  All the other ports are okay and are receiving data with their respective handles.  
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