[Ovmsdev] WiFi client not switching to better AP

[Michael Balzer]

Steve,

scanning for networks is possible now without disrupting the Wifi mode, 
but TCP connections won't survive a switch to another network.

So if you implement that, I suggest only switching to another known 
network if it's substantially better than the current one.

Regards,
Michael


Am 07.12.20 um 22:27 schrieb Stephen Casner:
> Michael,
>
> Thanks for the suggestions.  Since I only use the WiFi when the car is
> in my garage where I now have a nearby AP, I don't need to worry about
> trying to keep a connection when the signal is poor so the event idea
> should do the trick.
>
> My laptop can switch from one AP to another as I move around without
> dropping network connections.  So I guess it can hear other APs and
> decide when to switch for a better signal.  Could the OVMS hardware
> and driver allow that?
>
>                                                          -- Steve
>
> On Mon, 7 Dec 2020, Michael Balzer wrote:
>
>> Steve,
>>
>> that's something we can control.
>>
>> If you don't mind frequent disconnects in poor Wifi situations, a simple
>> solution now is to attach a "wifi reconnect" command call to the
>> "network.wifi.sta.bad" event. I added that command on the Wifi rework some
>> months ago.
>>
>> For a better, general solution, we could e.g. count the "network.wifi.sta.bad"
>> events on the same network (or better: check the event frequency) and
>> disconnect when reaching some (tunable) threshold. The next automatic scan
>> then connects to the best network available. Getting stuck in the "bad signal"
>> state for too long would also need to trigger a disconnect.
>>
>> Regards,
>> Michael
>>
>>
>> Am 07.12.20 um 07:21 schrieb Stephen Casner:
>>> Many months ago I installed another AP for the home network in my
>>> garage because the signal quality to the main router was too poor for
>>> OVMS to operate.  Today I needed to restart the garage AP, so OVMS
>>> hear the main router again and associated to it.  But even after the
>>> garage AP came back up, OVMS stuck with the main router and kept
>>> toggling between WiFi and modem because the signal quality was bad.
>>>
>>> It this behavior just a function of the WiFi driver that we can't
>>> control, or is it something we could improve?
>>>
>>> I fixed it by "wifi mode off" then "wifi mode client".
>>>
>>>                                                           -- Steve
>>>
>>> I (513443477) netmanager: WIFI client has bad signal quality (-89.2 dBm);
>>> disconnect
>>> I (513443477) netmanager: Interface priority is pp2
>>> (10.170.41.247/255.255.255.255 gateway 10.64.64.64)
>>> I (513443477) netmanager: Set DNS#0 8.8.8.8
>>> I (513443477) netmanager: Set DNS#1 8.8.4.4
>>> I (513443477) netmanager: WIFI client down (with MODEM up): reconfigured for
>>> MODEM priority
>>> I (513443537) time: Network was reconfigured: restarting SNTP client
>>> I (513443547) ovms-server-v2: Network was reconfigured: disconnect, and
>>> reconnect in 10 seconds
>>> I (513443547) ovms-server-v2: Status: Network was reconfigured: disconnect,
>>> and reconnect in 10 seconds
>>> I (513443717) ovms-server-v2: Status: Disconnected
>>> I (513463467) ovms-server-v2: Connection is api.openvehicles.com:6867 US33
>>> I (513463467) ovms-server-v2: Status: Connecting...
>>> I (513466157) ovms-server-v2: Connection successful
>>> I (513466157) ovms-server-v2: Status: Logging in...
>>> ...
>>> I (513522477) netmanager: WIFI client has good signal quality (-86.9 dBm);
>>> connect
>>> I (513522477) netmanager: Interface priority is st13
>>> (192.168.1.74/255.255.255.0 gateway 192.168.1.254)
>>> I (513522477) netmanager: Set DNS#0 8.8.8.8
>>> I (513522477) netmanager: Set DNS#1 8.8.4.4
>>> I (513522477) netmanager: WIFI client up (with MODEM up): reconfigured for
>>> WIFI client priority
>>> I (513522527) time: Network was reconfigured: restarting SNTP client
>>> I (513522527) ovms-server-v2: Network was reconfigured: disconnect, and
>>> reconnect in 10 seconds
>>> I (513522527) ovms-server-v2: Status: Network was reconfigured: disconnect,
>>> and reconnect in 10 seconds
>>> I (513522697) ovms-server-v2: Status: Disconnected
>>> I (513529477) netmanager: WIFI client has bad signal quality (-89.0 dBm);
>>> disconnect
>>> I (513529477) netmanager: Interface priority is pp2
>>> (10.170.41.247/255.255.255.255 gateway 10.64.64.64)
>>> I (513529477) netmanager: Set DNS#0 8.8.8.8
>>> I (513529477) netmanager: Set DNS#1 8.8.4.4
>>> I (513529477) netmanager: WIFI client down (with MODEM up): reconfigured for
>>> MODEM priority
>>> I (513529527) time: Network was reconfigured: restarting SNTP client
>>> I (513529537) ovms-server-v2: Network was reconfigured: disconnect, and
>>> reconnect in 10 seconds
>>> I (513529537) ovms-server-v2: Status: Network was reconfigured: disconnect,
>>> and reconnect in 10 seconds
>>> I (513539467) ovms-server-v2: Connection is api.openvehicles.com:6867 US33
>>> I (513539467) ovms-server-v2: Status: Connecting...
>>> I (513541987) ovms-server-v2: Connection successful
>>> I (513541987) ovms-server-v2: Status: Logging in...
>>> _______________________________________________
>>> OvmsDev mailing list
>>> OvmsDev at lists.openvehicles.com
>>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
>> --
>> Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
>> Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
> _______________________________________________
> OvmsDev mailing list
> OvmsDev at lists.openvehicles.com
> http://lists.openvehicles.com/mailman/listinfo/ovmsdev

-- 
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26


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