[Ovmsdev] First connection to car

Mark Webb-Johnson mark at webb-johnson.net
Sat Mar 24 21:04:49 HKT 2018

The ovms server v3 is very experimental, and not complete. In particular, there is currently no rate limiting of metric output. Really just a proof of concept at the moment. It is fine for the DEMO vehicle module, for me, but with a real vehicle module I think the output stream would be quickly overwhelmed. Perhaps that is the reason for the mongoose fault adding to a buffer?

I remember that mqtt message when I was playing with server v3 before. Something about mongoose going back and modifying the headers to the MQTT message, after it has prepared the message itself, but mg_send having already sent those headers out. Have a look back in this mailing list for subject 'Transition to new esp-idf’ around 19th through 22nd January. But I thought we had rolled back the changes to mongoose that caused that.

I can’t really work on server v3 at the moment, until we have a very stable base for ovms v3.1, using server v2. We’re going to have real users soon, and I need to ensure they have a workable system. This will also give us a lot of real world experience with the modules in cars (which we are missing).

Let’s revisit this in a month or so, once v3.1 hardware is out and running ok.

Regards, Mark.

> On 24 Mar 2018, at 7:59 PM, Julien “JaXX” Banchet <jaxx at jaxx.org> wrote:
> On 24 Mar 2018 at 12:03 +0100, Mark Webb-Johnson <mark at webb-johnson.net>, wrote:
>> I have my phone’s wifi hotspot on the module as well. So, even on the road I can just turn that on, the module connects to my phone, then I can get back into it directly.
>> I think AP is fine now - just trying to minimise the number of things I am using so as to get a very stable base. Then can enable other things and if it breaks I know where to check.
>> Regards, Mark. 
> Yes, you can scratch what I said earlier, the very last commits made AP non-blocking.
> Before switching to AP, I had client mode on, and I did have v2 and v3 enabled at the same time which crash looped a few times on a very steady "assertion "nc->send_mbuf.len >= len" failed: file "/Users/jaxx/Projects/Open-Vehicle-Monitoring-System-3/vehicle/OVMS.V3/components/mongoose/mongoose/mongoose.c", line 10573, function: mg_mqtt_prepend_header” during "v3 TX(all) metrics", and even with v2 disabled… Swapped v3 for v2, rock stable, from my desk
> But, in AP mode, v3 (alone in auto) doesn’t connect once PPP comes online:
> https://pastebin.com/EjCyfvLS <https://pastebin.com/EjCyfvLS>
> (I have tried this multiple times, v3 upon startup hangs the module if I ever try to restart, either v2 or v3 btw)
> If started with v2 only, all goes fine, and I can even stop start both without any real hiccup:
> https://pastebin.com/G0357xQW <https://pastebin.com/G0357xQW>
> Anyone who wants to play with mqtt in Europe for v3 can use:
> libre.jaxx.org being Fiber at home near Paris, mqtt on a virtual container in my lab
> mqtt.jaxx.org is a small server in the Netherlands
> Both mosquitto 1.4.10 with simple authentication
> config set server.v3 server libre.jaxx.org
> Or
> config set server.v3 server mqtt.jaxx.org
> config set server.v3 user ovmsdev
> config set server.v3 password 0vmsd3v
> #(I will take it out one day or another, but will most certainly forget it unless it gets hacked :-) )
> JB./.
> _______________________________________________
> OvmsDev mailing list
> OvmsDev at lists.teslaclub.hk
> http://lists.teslaclub.hk/mailman/listinfo/ovmsdev

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