HTML 5 app on Garmin 922 with RPI

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danielhedstrom asked Feb 12, '23

HTML 5 app on Garmin 922 with RPI

Hi,

Im trying to get the HTML 5 app working on may Garmin 922. Ive enabled MQTT on LAN (both options) and connected the Ethernet port to the marine network port on the Garmin, and set up WIFI on the RPI to communicate with my wifi router. That is, I've tried to follow the instructions for the Cerbo GX setup with a Garmin MFD.

However, I don't see the Victon HTML 5 app on the Garmin device.

Any ideas?

Running the latest firmware on the Garmin, and Venus OS 2.92 on the RPI.

Raspberry Pi marine mfd app html5

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Stefanie (Victron Energy Staff) ♦♦ commented · Feb 12, 2023 at 05:34 PM

@danielhedstrom

Can you see communication between the GX and the MFD (somewhere in the network settings of your MFD)?

And did you use the original Garmin network cable as instructed in the guide? AFAIK Garmin uses crossover cables and has a different pinout than straight ethernet network cables.

See: https://support.garmin.com/en-US/?faq=MNUtEt8k5EA2s8dR9eqIQ9

And: https://static.garmin.com/pumac/Marine_Ethernet.pdf

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danielhedstrom commented · Feb 12, 2023 at 05:54 PM

Hi, thanks for your quick response!

I don't have the Cerbo, running on a Raspberry pi 3b+, hope I posted in the right place, modifications?

I thought it was a regular cable, I will need to check this, thanks.

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Stefanie (Victron Energy Staff) ♦♦ danielhedstrom commented · Feb 12, 2023 at 06:27 PM

Yes, I meant GX in reference to Venus OS on your Pi. Modification space is perfectly fine :-)

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stephenm27 commented · Feb 15, 2023 at 07:57 PM

I, too, have been trying to do this for some time. To date, I cannot successfully reverse engineer what the Garmin MFD expects in order to render the Victron app icon as a OneHelm app on the MFD display.

My setup is also a RPi, Garmin 922xs+. Connection to the Garmin IP network is verified (and utilizes standard eth cable btw).

There are various different multicast broadcasts that the Garmin routinely transmits, but the one I have found most likely involved, is the UPnP discovery probe to 239.255.255.250 port 1900 (5 sec periodicity). I have responded to this probe with a resource location url (of the Victron app entry point) which the Garmin subsequently accesses via HTTP, but the process ends there. No further communications occurs (beyond the continued repetitive mcast data and probes) and no app icon shows up.

A wireshark/tcpdump capture of the successful communication exchange (between a Cerbo GX and MFD) would help immensely if someone is willing/able to provide one...

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Modifications Space

Node Red Space

Answer 1 · 2023-02-20T14:48:07Z

Peter Buijs - NL answered · Feb 20, 2023 at 02:48 PM

https://www.victronenergy.com/live/venus-os:mfd-garmin

and

Marine_Ethernet(1).pdf

The Garmin Marine Ethernet leaflet is suggesting an Ethernet Cross Cable pins 1+2 and 3+6 crossed

If a crosscable is not available, maybe use a small 100mbit switch with auto mdi/mdix the you can see you have a link (connection)

marine-ethernet1.pdf (260.6 KiB)

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Answer 2 · 2023-02-22T14:56:00Z

stephenm27 answered · Feb 22, 2023 at 02:56 PM

Update: I have now been able to successfully get the Garmin 922xs and RPi to communicate.

Specifically, I can now run my custom html5 app on the MFD, using the OneHelm mechanism. In short, the multicast DNS and UPnP daemons are required. These two services advertise configuration info that the Garmin expects to retrieve in order to render a OneHelm application.

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jpruel commented · Sep 16, 2023 at 03:26 PM

is it possible to give us the recipe you are using to be able to show a custom icon and web page on your MFD

Thanks

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stephenm27 jpruel commented · Nov 01, 2023 at 04:31 PM

See the thread here for this info:

https://community.victronenergy.com/questions/118708/garmin-onehelm-details.html

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Answer 3 · 2023-05-24T07:05:48Z

chronix answered · May 24, 2023 at 07:05 AM

Hi

could you please share you HTML5 code for me to take a look. I would like to build one for my own use as well.

please send an email to me at damiangohyk@gmail.com

thanks

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Answer 4 · 2023-05-24T12:18:15Z

kurtinge answered · May 24, 2023 at 12:18 PM

I had to use a network cable and not the wlan against my B&G. After that everything was working fine. I know my neighbour also had to use cable at his Raymarine MFD

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