This shell command works on android version 6.0+ : type su to enter superuser mode. Then type the following command:
settings put global captive_portal_detection_enabled 0
This command disables the “drop wifi if no internet connection” functionality and stops checking if internet access is available.
Great tool for monitoring wifi signal quality:
wavemon
example output:
┌─Interface──────────────────────────────────────────────────────────┐ │wlan0 (IEEE 802.11bgn), ESSID: "WiFiName" │ ├─Levels─────────────────────────────────────────────────────────────┤ │ │ │link quality: 63% (44/70) │ │============================================================ │ │ │ │signal level: -66 dBm (0.25 nW) │ │=================================== │ │ │ │ │ ├─Statistics─────────────────────────────────────────────────────────┤ │RX: 5,444 (4.69 MiB), invalid: 0 nwid, 0 crypt, 0 frag, 287 misc │ │TX: 4,925 (722.58 KiB), mac retries: 0, missed beacons: 0 │ ├─Info───────────────────────────────────────────────────────────────┤ │mode: Managed, access point: aa:cc:44:40:33:22 │ │freq: 2.437 GHz, bitrate: 65 Mbit/s │ │power mgt: off, tx-power: 27 dBm (501.19 mW) │ │retry: short limit 7, rts/cts: off, frag: off │ │encryption: n/a (requires CAP_NET_ADMIN permissions) │ ├─Network────────────────────────────────────────────────────────────┤ │mac: 11:26:55:92:44:33, ip: 10.0.0.33/24 │ └────────────────────────────────────────────────────────────────────┘ F1info F2lhist F3scan F4 F5 F6 F7prefs F8help F9about F10quit
