Ghost Nodes (Eeeek!).

  • Twice in the last month I have seen 'Ghost' nodes appearing.

    These 'ghost' nodes seem to happen overnight and can even have a 'ghost sensor' attached to them.

    Of course, I know that they are not real and simply delete them. But a non-existent node and sensor register with the controller? How does this happen?


    @skywatch You might have a problem with hardware, serial port driver or MyController serial parsing.

    Do you see any ERROR or WARN in mycontroller.log related to your ghost nodes? can you check the log?

  • @jkandasa Thanks, there is nothing in the server log relating to the creation of the nodes. I usually find them in the topo or resource view.


    @skywatch I hope it should be a hardware issue(maybe with cheap Chinese clones).
    Can you add MY_NODE_ID in the sketch?

  • @jkandasa Thanks ...

    All nodes already have a MY_NODE_ID allocated to them (As well as #define MY_PARENT_NODE_ID 0 & #define MY_PARENT_NODE_IS_STATIC. That way I am sure what is where and can have a logical numbering system.

    I have tried 3 different SD cards and now don't use any sd cards at all as it all boots and runs from a Kingston A400 SSD (120Gb) via usb.
    I have tried different cables and power supplies, added multiple capacitors and ferrite beads.
    I am on the 4th pro mini module as the GW. All of them had no problems when attached to the PC, so assume it is not the issue, but I could be wrong!
    I have tried at least 5 radio modules (all with caps) and currently using the mysensors recommended EBYTE modules. I don't really have an issue with them.
    I've tried a pi 2 and 2x pi 3's.
    I could try again with a 5V pro mini as I recently got a shipment of level converters, so that's the last thing I can think of....

    Things are getting better slowly. I still get occasional corrupted packets, but only a few a day now, that and the ghost nodes. Otherwise it's not too bad.


    @skywatch Seems I have to set up a serial gateway to reproduce this issue.

    Are you using USBtoSerial or direct TxRx of RPI?

  • @jkandasa Direct using short (60mm) cables, tx/rx from pro mini to tx/rx on rpi.

    GW is using a 3.3v 8MHz pro mini to eliminate the need for level shifter. 38400 baud rate (have tried 19200 and 9600 as well in the past).

    As I said before please do not use your time on this. Lets see how it goes with the 'new' mycontroller when it is released and if it is still a problem at that point then maybe it's worth a look.

    I guess not many people are running their set up like mine.

  • @skywatch

    I awoke this morning and checked in with myc resources, this is what I find.....
    All the 'red' nodes are ghosts that do not exist in real life.....



  • @jkandasa Thank you once again! 😉

    I totally removed arduino ide from the laptop and reinstalled only the latest version (1.8.7). Then I took the GW apart and recrimped some of the dupont connectors (some Chinese ones are poor quality). I reflashed the GW skecth (clearing eeprom first) and reconnected it all back up. Since doing this, no ghost nodes have appeared in the last 20 hours!....

    Maybe they have all left for Halloween ? 😉


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