[Ovmsdev] Do I have to flash "entire chip" with esptool if I already have the code on my OVMS box?

[Michael Balzer]

Steve,

side note: according to the "received" headers it seems you're sending 
all messages twice, please check your mail client/setup.

Most cars have some live status frames (called "process data objects" in 
CANopen), some need polling. Nearly all car adaptions use OBD polling to 
retreive extended info. Polling is necessary on the OBD2 variant of the 
VW e-Up, and IIRC also on the newer Nissan Leaf models.

I suggest looking at the e-Up OBD for reference first, as it uses only 
polling and is simple & clean.

Having no status frames means you may also need to poll to detect the 
vehicle power status, but that may keep the car alive and drain the 12V 
battery. The e-Up OBD variant uses the 12V level as a hint, maybe that's 
an option for you as well.

Regards,
Michael


Am 05.12.20 um 14:07 schrieb Steve Davies:
> Hi Michael,
>
> Thanks for the reply.  I was able to flash my build OTA using the web 
> server on my laptop and it's running with no trouble.
>
> So far I have added a "stub" for the i3 as per the docs. It is 
> selectable on the OVMS but of course doesn't produce any data.
>
> On the i3 you have to send in obd2 requests in order to get data - I 
> think other cars just chatter away unprompted.
>
> Is there another vehicle type that works similarly so I can look at 
> the code to see how it should be done?
>
> I'm hoping that I can poll the rapidly changing stuff frequently and 
> then the more static pids maybe once a minute or something.
>
> Steve
>
>
>
> On Sat, 5 Dec 2020 at 13:52, Michael Balzer <dexter at expeedo.de 
> <mailto:dexter at expeedo.de>> wrote:
>
>     Steve,
>
>     I know of no case of bricking by flashing the firmware.
>
>     Using the developing environment, a simple "make app-flash" will
>     do the esptool call for you.
>
>     Of course you can also flash OTA. I usually flash my
>     desk/development module by USB and the one in my car via Wifi from
>     my local server. It's up to you. Flashing OTA can only update the
>     firmware, but that's normally sufficient.
>
>     The "-dirty" tag is appended when building from a "dirty" working
>     tree, i.e. one with uncommitted changes.
>
>     Regards,
>     Michael
>
>
>     Am 05.12.20 um 11:40 schrieb Steve Davies:
>>     Hi Mark et-al,
>>
>>     I've installed the esp32 and the esp-idf environments on my Mac
>>     and successfully build the OVMS firmware.
>>
>>     In the developer guide it then covers how to flash the box with
>>     esptool.
>>
>>     But: do I need to do that? - my OVMS box is up and running already -
>>
>>     I'm guessing I can use OTA update to update with
>>
>>     steve at maximus OVMS.V3 % ls -l  build/ovms3.bin
>>     -rw-r--r--  1 steve  staff  2986336 Dec  5 12:24 build/ovms3.bin
>>
>>     ?
>>
>>     Since the "flash from web" and and "flash from file" are looking
>>     for an ovms.bin.
>>
>>     Nervous to brick my box since it was expensive to get it to Cape
>>     Town.
>>
>>     By the way, my build prints 'App "ovms3" version:
>>     3.2.015-162-g10232c58-dirty'
>>
>>     I recognise the git commit hash, but what is the "-dirty"?
>>
>>     (I build a "bmwi3" branch of a fork of the original project -
>>     maybe that answers my own question?)
>>
>>     My OVMS box currently says it's running "3.2.015/ota_0/main
>>     (build idf v3.3.2-881-g22d636b7b Sep 2 2020 08:32:35)"
>>
>>     Thanks,
>>     Steve
>>
>>
>>
>>
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>
>     -- 
>     Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>     Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
>
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-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26

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