Some example output from wpa_supplicant:
I've tried several fixes that worked for other people, including updating the kernel, disabling power management, setting the regulatory domain, and switching the channel of the router, without any success. Disabling the software AP doesn't help either. However, I've made a couple of interesting discoveries.
Code: Select all
wlan0: CTRL-EVENT-DISCONNECTED bssid=60:02:92:cd:d9:30 reason=0 locally_generated=1 wlan0: CTRL-EVENT-REGDOM-CHANGE init=CORE type=WORLD wlan0: CTRL-EVENT-REGDOM-CHANGE init=USER type=COUNTRY alpha2=US wlan0: Trying to associate with SSID 'MySSID' wlan0: CTRL-EVENT-ASSOC-REJECT status_code=16 wlan0: Trying to associate with SSID 'MySSID' wlan0: Associated with 60:02:92:cd:d9:30 wlan0: CTRL-EVENT-REGDOM-CHANGE init=COUNTRY_IE type=COUNTRY alpha2=US wlan0: WPA: Key negotiation completed with 60:02:92:cd:d9:30 [PTK=CCMP GTK=TKIP] wlan0: CTRL-EVENT-CONNECTED - Connection to 60:02:92:cd:d9:30 completed [id=0 id_str=]
Firstly, the instability seems to be affected by use of the built-in Bluetooth, which our project also requires. Running a repeated Bluetooth inquiry greatly increases the rate of disconnects reported by the RPi's wpa_supplicant, and also seems to make it less likely that the reassociation will succeed.
Secondly, the instability only seems to occur on WiFi routers supporting 802.11n. This is based on the following sample, which admittedly isn't very large:
1. Cisco DPC3939B (n) - unstable
2. Cisco Linksys E1200 (n) - unstable
3. Netgear WNDR3400 (n) - unstable in n mode, but stable when limited to 54 Mbit/s.
4. Linksys WAP54G v3 (g) - stable
Based on these observations, I'd like to try limiting the BCM43438 chip's data rate and forcing it to connect as an 802.11g device, but it's not clear whether this is possible using the existing drivers.
Other installation details:
Raspberry Pi 3 Model B with official power supply
No USB devices
Raspbian Jessie from March 2016 with up-to-date packages, rpi-updated to kernel 4.4.6
Any recommendations would be much appreciated.