This forum uses cookies
This forum makes use of cookies to store your login information if you are registered, and your last visit if you are not. Cookies are small text documents stored on your computer; the cookies set by this forum can only be used on this website and pose no security risk. Cookies on this forum also track the specific topics you have read and when you last read them. Please confirm whether you accept or reject these cookies being set.

A cookie will be stored in your browser regardless of choice to prevent you being asked this question again. You will be able to change your cookie settings at any time using the link in the footer.

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
CAN0 PGN-126996 malformed
#1
Hi,

When sniffing the CANbus I realise SignalK server is sending a broken pgn-126996 (0x1F014) messages, this trigger the Garmin Multi-Function Display to keep asking for it and generating lots of noise on the NMEA bus.

Signalk version: 2.11.0
OpenPlotter: latest
CPU: RPI 5, 8Gb with SDD
HAT:  PICAN-M

Details:

can0  18EA6400  [3]  14 F0 01
--> priority 6, pgn 0xEA00, destination 0x64 (SignalK), source 0x00 (Garmin Multi Function Display), request for pgn 0x01F014

can0  0DF01464  [8]  40 86 20 D6 9B 02 53 69
can0  0DF01464  [8]  41 67 6E 61 6C 20 4B FF
can0  0DF01464  [8]  42 FF FF FF FF FF FF FF
can0  0DF01464  [8]  43 FF FF FF FF FF FF FF
can0  0DF01464  [8]  44 FF FF FF FF FF FF FF
can0  0DF01464  [8]  45 FF FF 32 2E 31 30 2E
can0  0DF01464  [8]  46 30 FF FF FF FF FF FF
can0  0DF01464  [8]  47 FF FF FF FF FF FF FF
can0  0DF01464  [8]  48 FF FF FF FF FF FF FF
can0  0DF01464  [8]  49 FF FF FF FF FF FF 63
can0  0DF01464  [8]  4A 61 6E 62 6F 61 74 6A
can0  0DF01464  [8]  4B 73 FF FF FF FF FF FF
--> priority 3, pgn 0x1F014, destination 0xFF(all), source 0x64(Signalk), message length -> 134 bytes long (0x40 0x86).
The issue: the message is 77bytes long and not 134 bytes long.

If I compare with another device and I compare I will have:
can0  19F01477  [8]  40 86 35 08 9A 02 44 75
can0  19F01477  [8]  41 76 69 76 69 65 72 20
can0  19F01477  [8]  42 4D 61 72 69 6E 65 20
can0  19F01477  [8]  43 2D 20 54 61 6E 6B 20
can0  19F01477  [8]  44 73 65 6E 73 6F 72 FF
can0  19F01477  [8]  45 FF FF 70 79 74 68 6F
can0  19F01477  [8]  46 6E 20 30 2E 31 61 FF
can0  19F01477  [8]  47 FF FF FF FF FF FF FF
can0  19F01477  [8]  48 FF FF FF FF FF FF FF
can0  19F01477  [8]  49 FF FF FF FF FF FF 74
can0  19F01477  [8]  4A 65 73 74 20 30 2E 31
can0  19F01477  [8]  4B 61 FF FF FF FF FF FF
can0  19F01477  [8]  4C FF FF FF FF FF FF FF
can0  19F01477  [8]  4D FF FF FF FF FF FF FF
can0  19F01477  [8]  4E FF FF FF 30 30 30 30
can0  19F01477  [8]  4F 30 30 30 31 FF FF FF
can0  19F01477  [8]  50 FF FF FF FF FF FF FF
can0  19F01477  [8]  51 FF FF FF FF FF FF FF
can0  19F01477  [8]  52 FF FF FF FF FF FF FF
can0  19F01477  [8]  53 00 01 FF FF FF FF FF
--> priority 6, pgn 0x1F014, destination 0xFF(all), source 0x77(My own development), message length -> 134 bytes long (0x40 0x86).
This message is 134 bytes and understood by the Garmin (address 0x00).

Thanks in advance 
Bertrand Duvivier
Reply
#2
(2024-10-01, 12:42 PM)loutre Wrote: Working with SignalK to get it resolve ;-)

Hi,

When sniffing the CANbus I realise SignalK server is sending a broken pgn-126996 (0x1F014) messages, this trigger the Garmin Multi-Function Display to keep asking for it and generating lots of noise on the NMEA bus.

Signalk version: 2.11.0
OpenPlotter: latest
CPU: RPI 5, 8Gb with SDD
HAT:  PICAN-M

Details:

can0  18EA6400  [3]  14 F0 01
--> priority 6, pgn 0xEA00, destination 0x64 (SignalK), source 0x00 (Garmin Multi Function Display), request for pgn 0x01F014

can0  0DF01464  [8]  40 86 20 D6 9B 02 53 69
can0  0DF01464  [8]  41 67 6E 61 6C 20 4B FF
can0  0DF01464  [8]  42 FF FF FF FF FF FF FF
can0  0DF01464  [8]  43 FF FF FF FF FF FF FF
can0  0DF01464  [8]  44 FF FF FF FF FF FF FF
can0  0DF01464  [8]  45 FF FF 32 2E 31 30 2E
can0  0DF01464  [8]  46 30 FF FF FF FF FF FF
can0  0DF01464  [8]  47 FF FF FF FF FF FF FF
can0  0DF01464  [8]  48 FF FF FF FF FF FF FF
can0  0DF01464  [8]  49 FF FF FF FF FF FF 63
can0  0DF01464  [8]  4A 61 6E 62 6F 61 74 6A
can0  0DF01464  [8]  4B 73 FF FF FF FF FF FF
--> priority 3, pgn 0x1F014, destination 0xFF(all), source 0x64(Signalk), message length -> 134 bytes long (0x40 0x86).
The issue: the message is 77bytes long and not 134 bytes long.

If I compare with another device and I compare I will have:
can0  19F01477  [8]  40 86 35 08 9A 02 44 75
can0  19F01477  [8]  41 76 69 76 69 65 72 20
can0  19F01477  [8]  42 4D 61 72 69 6E 65 20
can0  19F01477  [8]  43 2D 20 54 61 6E 6B 20
can0  19F01477  [8]  44 73 65 6E 73 6F 72 FF
can0  19F01477  [8]  45 FF FF 70 79 74 68 6F
can0  19F01477  [8]  46 6E 20 30 2E 31 61 FF
can0  19F01477  [8]  47 FF FF FF FF FF FF FF
can0  19F01477  [8]  48 FF FF FF FF FF FF FF
can0  19F01477  [8]  49 FF FF FF FF FF FF 74
can0  19F01477  [8]  4A 65 73 74 20 30 2E 31
can0  19F01477  [8]  4B 61 FF FF FF FF FF FF
can0  19F01477  [8]  4C FF FF FF FF FF FF FF
can0  19F01477  [8]  4D FF FF FF FF FF FF FF
can0  19F01477  [8]  4E FF FF FF 30 30 30 30
can0  19F01477  [8]  4F 30 30 30 31 FF FF FF
can0  19F01477  [8]  50 FF FF FF FF FF FF FF
can0  19F01477  [8]  51 FF FF FF FF FF FF FF
can0  19F01477  [8]  52 FF FF FF FF FF FF FF
can0  19F01477  [8]  53 00 01 FF FF FF FF FF
--> priority 6, pgn 0x1F014, destination 0xFF(all), source 0x77(My own development), message length -> 134 bytes long (0x40 0x86).
This message is 134 bytes and understood by the Garmin (address 0x00).

Thanks in advance 
Bertrand Duvivier
Reply


Forum Jump:


Users browsing this thread: 1 Guest(s)