[Ovmsdev] Poor wifi performance

[Stephen Casner]

I'm still having poor wifi performance with 3.1.011.  As with earlier
releases, when I find OVMS is not responsive over wifi and connect to
the serial port I find this error repeating:

E (57630676) ovms-server-v2: mg_connect(api.openvehicles.com:6867) failed: cannot parse address|
E (57630676) ovms-server-v2: Status: Error: Connection failed
I (57637436) ovms-server-v2: Connection is api.openvehicles.com:6867 US33
I (57637436) ovms-server-v2: Status: Connecting...
E (57650836) ovms-server-v2: mg_connect(api.openvehicles.com:6867) failed: cannot parse address|
E (57650836) ovms-server-v2: Status: Error: Connection failed
I (57657436) ovms-server-v2: Connection is api.openvehicles.com:6867 US33
I (57657436) ovms-server-v2: Status: Connecting...

This can be cured by "wifi mode off" then "wifi mode client ..." to
bring wifi back up again.  The really bad part is that the wifi system
does not recognize that it has lost connectivity so the primary
interface does not switch over to the modem.

The "cannot parse address" error suggests that Mongoose is in some
strange state.  I've put in some debugging code to investigate just
how the parse is failing, and I'm waiting for it to get back into this
error loop.

Meanwhile, my ssh connection to OVMS dropped and my router says the
OVMS station is down, so I went to hook up to the serial console
again.  This mongoose complaint is not happening (yet).  But the wifi
does not recognize that it has no association with my router:

OVMS# wifi status
Power: on
Mode: Client mode

STA SSID: Revelstoke (-81 dBm)
  MAC: 30:ae:a4:43:9c:28
  IP: 192.168.1.74/255.255.255.0
  GW: 192.168.1.254
OVMS# network status
Interface#2: pp2 (ifup=1 linkup=1)
  IPv4: 10.170.41.247/255.255.255.255 gateway 10.64.64.64

Interface#1: st1 (ifup=1 linkup=1)
  IPv4: 192.168.1.74/255.255.255.0 gateway 192.168.1.254

DNS: 8.8.8.8 8.8.4.4

Default Interface: st1 (192.168.1.74/255.255.255.0 gateway 192.168.1.254)
OVMS# server v2 status
State: Connected
       OVMS V2 login successful, and crypto channel established
OVMS#

Even though server-v2 sends updates periodically, the failed wifi is
not detected.  So I guess that is the root problem.  I'm expecting
that after some time the mongoose state will deteriorate such that the
parse error occurs again and I can at least investigate that part.

                                                        -- Steve