Is this normal?

Ground Control Software Mission Planner
1

With the console window open in mission planner I am having these INFO lines with lost packets scrolling constantly. This happens when the IRIS+ is unarmed just sitting next to the laptop running mission planner.

Is something wrong with my radio, is this a configuration problem, or are these INFO entries normal?

Matt

2

Looks like a bug they have not corrected yet in mission planner.

Each Mavlink packet has a sequence number so you know if you dropped one. Apparently Mission Planner can’t add.

Mike

3

how where you connected? 3dr radio? antenna tracker? etc?

4

Connected via 3DR Radio… standard setup with the IRIS+

Matt

5

can you post the tlog? as it may show why it is happening

6

In module MAVLinkInterface.cs the packet counter is one more than it is and so we lost 255?

            try
            {
                if ((buffer[0] == 'U' || buffer[0] == 254) && buffer.Length >= buffer[1])
                {
                    // check if we lost pacakets based on seqno
                        byte packetSeqNo = buffer[2];
                        int expectedPacketSeqNo = ((MAVlist[sysid].recvpacketcount + 1) % 0x100);

                        {
                            if (packetSeqNo != expectedPacketSeqNo)
                            {
                                MAVlist[sysid].synclost++; // actualy sync loss's
                                int numLost = 0;

                                if (packetSeqNo < ((MAVlist[sysid].recvpacketcount + 1))) // recvpacketcount = 255 then   10 < 256 = true if was % 0x100 this would fail
                                {
                                    numLost = 0x100 - expectedPacketSeqNo + packetSeqNo;
                                }
                                else
                                {
                                    numLost = packetSeqNo - MAV.recvpacketcount;
                                }
                                MAVlist[sysid].packetslost += numLost;
                                WhenPacketLost.OnNext(numLost);

                                log.InfoFormat("lost pkts new seqno {0} pkts lost {1}", packetSeqNo, numLost);
                            }

                            MAVlist[sysid].packetsnotlost++;

                            MAVlist[sysid].recvpacketcount = packetSeqNo;
                        }
                        WhenPacketReceived.OnNext(1);
  
                    // packet stats
                    if (double.IsInfinity(packetspersecond[buffer[5]]))
                        packetspersecond[buffer[5]] = 0;

                    packetspersecond[buffer[5]] = (((1000 / ((DateTime.Now - packetspersecondbuild[buffer[5]]).TotalMilliseconds) + packetspersecond[buffer[5]]) / 2));

                    packetspersecondbuild[buffer[5]] = DateTime.Now;

Mike