[Ovmsdev] can polling

1 May 2020

      Can anybody help me understanding can polling?

I use the following code in 3.0.12 and older version.

i send every 60s when the car is on a following code:

CAN_frame_t frame;
    memset(&frame,0,sizeof(frame));
    frame.origin = m_can1;
    frame.FIR.U = 0;
    frame.FIR.B.DLC = 3;
    frame.FIR.B.FF = CAN_frame_std;
    frame.MsgID = 0x761;
    frame.data.u8[0] = 0x02;
    frame.data.u8[1] = 0x21;
    frame.data.u8[2] = 0x01;
    m_can1->Write(&frame);

At IncomingFrameCan1 i catch the response message at 0x762 and send a flow
control message (this values from can logging during genuine diagnostic use
on car)

if (d[0] == 16)
      {
        // Request CAC...
        CAN_frame_t frame;
        memset(&frame,0,sizeof(frame));
        frame.origin = m_can1;
        frame.FIR.U = 0;
        frame.FIR.B.DLC = 3;
        frame.FIR.B.FF = CAN_frame_std;
        frame.MsgID = 0x761;
        frame.data.u8[0] = 0x30;
        frame.data.u8[1] = 0x08;
        frame.data.u8[2] = 0x0A;
        m_can1->Write(&frame);
}

And with this is get some data (CAC)

But if i use polling with the following values

static const OvmsVehicle::poll_pid_t vehicle_mitsubishi_polls[] =
  {
    { 0x761, 0x762, VEHICLE_POLL_TYPE_OBDIIGROUP,  0x02, {       0,  10,
10 } }, // cac
     { 0, 0, 0, 0, { 0, 0, 0 } }
  };

i get the following in void OvmsVehicleMitsubishi::IncomingPollReply....

I (178194) v-mitsubishi: 762 TYPE:21 PID:02 7 01 7e 01 7e 01 7f 01 00
I (178224) v-mitsubishi: 762 TYPE:21 PID:02 7 7e 01 7e 01 7e 01 7e 00
I (178284) v-mitsubishi: 762 TYPE:21 PID:02 7 01 7e 01 7e 01 7e 01 00
I (178284) v-mitsubishi: 762 TYPE:21 PID:02 7 7e 01 7e 01 7e 01 7e 00
I (178314) v-mitsubishi: 762 TYPE:21 PID:02 7 01 7e 01 7e 01 7e 01 00
I (178344) v-mitsubishi: 762 TYPE:21 PID:02 7 7e 01 7e 01 7e 01 7e 00
I (178374) v-mitsubishi: 762 TYPE:21 PID:02 7 01 7e 01 7e 01 7e 01 00
I (178404) v-mitsubishi: 762 TYPE:21 PID:02 7 7e 01 7e 01 7e 01 7e 00
I (178434) v-mitsubishi: 762 TYPE:21 PID:02 7 01 7e 01 7e 01 7e 01 00
I (178464) v-mitsubishi: 762 TYPE:21 PID:02 7 7e 01 7e 01 7e 01 7e 00
I (178494) v-mitsubishi: 762 TYPE:21 PID:02 7 01 7e 01 7e 00 00 00 00

i run a can logging with this session and i only see the same data
(incomping poll reply) only the  d[0] is changed.

What do i do wrong?

[Ovmsdev] can polling

Tamás Kovács