[Ovmsdev] MQTT and Ovms Server v3

[Jakob Löw]

Hey,

I've been playing around a bit with implementing SSL/TLS support. For
starters I wanted to implement an OvmsNetTlsConnection class which
could then be used for https requests. At first I tried using wolfSSL
but it turns out wolfSSL is compiled with WOLFCRYPT_ONLY. OpenSSL also
didn't work as SSL_CTX_load_verify_locations is missing in ESP-IDF's
OpenSSL. I didn't try mbedtls yet. Is there a reason why OVMS bundles
three different SSL libraries? Also why is there a custom HTTP
implementation when mongoose already has one? Speaking of mongoose, it
seems to have an abstraction layer which allows to use one of the three
SSL/TLS libraries. IMO the best way would be to rewrite ovms_net and
ovms_http to use mongoose and configure mongoose to compile with SSL
support (probably mbedtls as the other two don't work).

- Jakob

On Mon, 2018-07-16 at 12:47 +0800, Mark Webb-Johnson wrote:
> Drupal authentication is done, and working against mosquitto now on
> the live api.openvehicles.com site. Plain text MQTT only at the
> moment (I still need to get mosquitto and OVMS module firmware
> supporting SSL).
> 
> To configure OVMS v3 to use Server V3 protocol:
> 
> config set:
> vehicle id <vehicleid>
> server.v3 server api.openvehicles.com
> server.v3 port 1883
> server.v3 user <openvehicles.com username>
> password server.v3 <openvehicles.com password>
> 
> server v3 start
> 
> Can also 'config set auto server.v3 yes’ to auto-start at boot
> 
> If you have an MQTT client, you can connect to the same server to
> query the metrics, issue commands, etc. The default topic hierarchy
> is ovms/<username>/<vehicleid>.
> 
> I think we are close now. Just need SSL support. And then Apps…
> 
> Feedback appreciated.
> 
> Regards, Mark.
> 
> > On 10 Jul 2018, at 2:42 PM, Mark Webb-Johnson <mark at webb-johnson.ne
> > t> wrote:
> > 
> > I’ve just pushed the support for notifications in OVMS Server v3.
> > 
> > With that, the server v3 is functionally complete (at least on the
> > car side). We can:
> > 
> > Connect/disconnect
> > Handle lists of apps connecting/disconnecting
> > Send metrics
> > Send events
> > Send notifications (including info, error, alert, and historical
> > data)
> > Receive commands, run them, and return the results
> > 
> > I’m still struggling against drupal authentication at the server
> > side; once that is done we can open this up to wider testing.
> > 
> > Overall, I’m pretty happy with it. We need SSL/TLS support, but at
> > least functionally now it works and is complete.
> > 
> > Regards, Mark
> > 
> > > On 6 Jul 2018, at 4:16 PM, Mark Webb-Johnson <mark at webb-johnson.n
> > > et> wrote:
> > > 
> > > > > > I suppose the following topic names:
> > > > > > metrics:       <prefix>/metric/#
> > > > > > events:        <prefix>/event/#
> > > > > > notifications: <prefix>/notify/#
> > > > > > config:        <prefix>/config/#
> > > > > > logs:          <prefix>/log/<tag>
> > > > > > active:        <prefix>/client/<clientid>/active
> > > > > > requests:      <prefix>/client/<clientid>/request/#
> > > > > > commands:      <prefix>/client/<clientid>/command/<command
> > > > > > id>
> > > > > > cmd responses: <prefix>/client/<clientid>/response/<command
> > > > > > id>
> > > > > 
> > > > > All ok. I am fine with this, and looks clean. I will make the
> > > > > changes today, as I want to get this into some cars asap so
> > > > > we can get a feel for how it behaves.
> > > 
> > > Ok. Now implemented, and tested:
> > > 
> > > <prefix>/metric/#
> > > <prefix>/client/<clientid>/active
> > > <prefix>/client/<clientid>/command/<command id>
> > > <prefix>/client/<clientid>/response/<command id>
> > > 
> > > I don’t think config, logs, and requests are critical or urgent.
> > > So, I will try to finish events tonight (as that is relatively
> > > simple). Notifications over the weekend (more tricky, especially
> > > for historical data). It can go in my car with tonight’s nightly
> > > ota, for real world testing.
> > > 
> > > I’m still trying to get the authentication working for drupal vs
> > > mosquitto. Once that is done, I can open up
> > > api.openvehicles.com MQTT for public use. If I can’t get it done
> > > within the next couple of days, I’ll try another broker (lua
> > > scripting, anyone?).
> > > 
> > > P.S. Commands over MQTT are pretty cool:
> > > 
> > > <PastedGraphic-2.tiff>
> > > <PastedGraphic-3.tiff>
> > > 
> > > Regards, Mark.
> > > _______________________________________________
> > > OvmsDev mailing list
> > > OvmsDev at lists.openvehicles.com
> > > http://lists.openvehicles.com/mailman/listinfo/ovmsdev
> > 
> > _______________________________________________
> > OvmsDev mailing list
> > OvmsDev at lists.openvehicles.com
> > http://lists.openvehicles.com/mailman/listinfo/ovmsdev
> 
> _______________________________________________
> OvmsDev mailing list
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