I have a rooted HR933 tablet running Android 4.4.2, and an embedded device with a Wi-Fi access point but no Internet access. I need the tablet's browser to be able to reach the device's web server via Wi-Fi, and also connect to the Internet via mobile data at the same time.
Super Download (see How do I connect to a wifi ap and 3g network simultaneously?) will not work because I need to browse, not just download files.
I'm trying to enable the Wi-Fi and mobile network adapters simultaneously as described here:
# enable dual-networking: pkill dhcpcd svc wifi disable svc data enable netcfg wlan0 up cd /data/misc/wifi/. wpa_supplicant -B -Dnl80211 -iwlan0 -c/data/misc/wifi/wpa_supplicant.conf dhcpcd wlan0 ip route add x.x.x.x via x.x.x.y # add any desired local route
The problem is that as soon as I do
svc wifi disable, the wlan0 adapter disappears. The script above implies wlan0 is still available after disabling Wi-Fi, but on this tablet it isn't:
netcfg tunl0 DOWN lo UP ifb1 DOWN ifb0 DOWN sit0 DOWN ccmni1 DOWN ccmni0 UP ccmni2 DOWN ip6tnl0 DOWN
So when I try
netcfg wlan0 up, I get
action 'up' failed (No such device).
After additional trial and error I've found that I can briefly get the dual network setup to work before the tablet disconnects itself from the embedded device's access point:
svc data prefermakes the mobile connection data preferred.
- Manually enable wlan0 with
netcfg wlan0 up.
- Connect to the device's AP via the Wi-Fi UI on the tablet.
I then have about 90 seconds where I can browse the embedded device's web server and pull up Internet websites in separate Chrome tabs at the same time. After that time the tablet disconnects from the device's Wi-Fi and wlan0 is shown as down with
netcfg. My logcat output includes this:
D/WifiStateTracker( 682): New state:CONNECTING, mLastState:CONNECTING D/ConnectivityService( 682): ConnectivityChange for WIFI: CONNECTING/CAPTIVE_PORTAL_CHECK D/WifiWatchdogStateMachine( 682): Network state change CAPTIVE_PORTAL_CHECK D/ConnectivityService( 682): Captive portal check NetworkInfo: type: WIFI, state: CONNECTING/CAPTIVE_PORTAL_CHECK, reason: (unspecified), extra: "EMBEDDED_DEVICE", roaming: false, failover: false, isAvailable: true, isConnectedToProvisioningNetwork: false, simId: 0 D/ConnectivityService( 682): Tear down low priority net WIFI
"EMBEDDED_DEVICE" is substituted for the actual SSID. That last line would seem to indicate it's a "low priority" network, but there doesn't seem to be a way to change its priority; it's also the only "known" network on the tablet.