Hi Alex,
Thanks - As @Adnaan-Yunus mentioned, we switched over to the ALFA wifi and moved forward with that drone. But, we just received a new drone (model MRB-D0012-4-V4-C28-M36-T8-K2) and are experiencing similar issues. I managed to catch some log messages when the wifi went down. TLDR: it looks like the USB disconnected unexpectedly; the drone was stationary on a table top when this happened.

Some additional context: the only configuration changes we made since unboxing was via voxl-wifi and we altered the RTSP address in voxl-mavcam-manager.conf. QGC was running when the USB disconnected with RTSP video displayed. The drone was not armed.

Here's the configuration (everything looks as we expect).

$ voxl-wifi WiFi is currently set up as follows: Mode: station Hardware: Concurrent STA+AP capable (AP:uap0, STA:mlan0) Station: Active on mlan0 - "WAVLINK" SoftAP: Disabled $ iwconfig ip6tnl0 no wireless extensions. sit0 no wireless extensions. ip_vti0 no wireless extensions. mlan0 IEEE 802.11-DS ESSID:"WAVLINK" [11] Mode:Managed Frequency=5.6 GHz Access Point: ********************* Bit Rate:175.5 Mb/s Tx-Power=24 dBm Retry limit:9 RTS thr=2347 B Fragment thr=2346 B Encryption key:****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-****-**** Security mode:open Power Management:off Link Quality=5/5 Signal level=-43 dBm Noise level=-93 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:462 Tx excessive retries:12 Invalid misc:24 Missed beacon:0 dummy0 no wireless extensions. ip6_vti0 no wireless extensions. lo no wireless extensions. bond0 no wireless extensions. uap0 IEEE 802.11-DS ESSID:"" Mode:Master Frequency:2.437 GHz Access Point: Not-Associated Encryption key:off Link Quality:0 Signal level:0 Noise level:0 Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:0 Invalid misc:0 Missed beacon:0 $ ifconfig bond0: flags=5123<UP,BROADCAST,MASTER,MULTICAST> mtu 1500 ether e6:71:39:a5:83:a1 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 dummy0: flags=195<UP,BROADCAST,RUNNING,NOARP> mtu 1500 inet6 fe80::1f3:bbc4:ab69:16bf prefixlen 64 scopeid 0x20<link> ether 6a:c1:84:76:8c:1c txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 12 bytes 3016 (3.0 KB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 1000 (Local Loopback) RX packets 104854 bytes 11086017 (11.0 MB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 104854 bytes 11086017 (11.0 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 mlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.30.104 netmask 255.255.255.0 broadcast 192.168.30.255 inet6 fe80::a637:6051:853a:6d93 prefixlen 64 scopeid 0x20<link> ether 8c:1f:64:69:da:d2 txqueuelen 1000 (Ethernet) RX packets 302 bytes 23251 (23.2 KB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 3784 bytes 1942045 (1.9 MB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

On another machine, we can ping and access to the web frontend http://192.168.30.104 looks good.

64 bytes from 192.168.30.104: icmp_seq=280 ttl=64 time=114 ms 64 bytes from 192.168.30.104: icmp_seq=281 ttl=64 time=126 ms 64 bytes from 192.168.30.104: icmp_seq=282 ttl=64 time=123 ms 64 bytes from 192.168.30.104: icmp_seq=283 ttl=64 time=123 ms 64 bytes from 192.168.30.104: icmp_seq=284 ttl=64 time=114 ms 64 bytes from 192.168.30.104: icmp_seq=285 ttl=64 time=118 ms 64 bytes from 192.168.30.104: icmp_seq=286 ttl=64 time=107 ms 64 bytes from 192.168.30.104: icmp_seq=287 ttl=64 time=108 ms 64 bytes from 192.168.30.104: icmp_seq=288 ttl=64 time=104 ms

However, with a few minutes the ping's stopped. I monitored dmesg -w and here's what was output when the wifi went down:

[ 433.066912] usb 2-1: USB disconnect, device number 3 [ 433.068450] Card is removed: -108 [ 433.068644] EP 2 Tx URB status failure: -108 [ 433.068701] EP 2 Tx URB status failure: -108 [ 433.068748] EP 2 Tx URB status failure: -108 [ 433.068794] EP 2 Tx URB status failure: -108 [ 433.068839] EP 2 Tx URB status failure: -108 [ 433.068885] EP 2 Tx URB status failure: -108 [ 433.068937] EP 2 Tx URB status failure: -108 [ 433.068985] EP 2 Tx URB status failure: -108 [ 433.069031] EP 2 Tx URB status failure: -108 [ 433.069085] EP 2 Tx URB status failure: -108 [ 433.069140] EP 2 Tx URB status failure: -108 [ 433.069190] EP 2 Tx URB status failure: -108 [ 433.069317] Card is removed: -108 [ 433.069344] Card is removed: -108 [ 433.069369] Card is removed: -108 [ 433.069393] Card is removed: -108 [ 433.069419] Card is removed: -108 [ 433.069446] Card is removed: -108 [ 433.070472] Block woal_cfg80211_deauthenticate in abnormal driver state [ 433.083826] Error deleting the crypto keys [ 433.083851] Error deleting the crypto keys [ 433.083863] Error deleting the crypto keys [ 433.083874] Error deleting the crypto keys [ 433.083884] Error deleting the crypto keys [ 433.083895] Error deleting the crypto keys [ 433.356084] USB: unregister device [ 433.357228] Free module params [ 433.704223] usb 2-1: new SuperSpeed Gen 1 USB device number 4 using xhci-hcd [ 433.722038] usb 2-1: New USB device found, idVendor=1286, idProduct=2052, bcdDevice=31.17 [ 433.722048] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 433.722053] usb 2-1: Product: Marvell Wireless Device [ 433.722057] usb 2-1: Manufacturer: Marvell [ 433.722062] usb 2-1: SerialNumber: 0000000000000000 [ 433.725632] USB probe: idVendor=1286 idProduct=2052 bInterfaceNumber=0 [ 433.725665] VID/PID = 1286/2052, Boot2 version = 3117 [ 433.725694] Attach moal handle ops, card interface type: 0x404 [ 433.725721] rps set to 0 from module param [ 433.725733] No module param cfg file specified [ 433.725756] rx_work=1 cpu_num=8 [ 433.725771] Enable moal_recv_amsdu_packet [ 433.725807] Attach mlan adapter operations.card_type is 0x404. [ 433.727974] Request firmware: nxp/usbusb8997_combo_v4.bin [ 434.220193] fw_dnld: 597712 bytes downloaded [ 434.996176] USB: unregister device [ 434.996231] Free module params [ 434.996608] usb 2-1: Disable of device-initiated U1 failed. [ 434.996691] usb 2-1: Disable of device-initiated U2 failed. [ 435.180482] usb 2-1: reset SuperSpeed Gen 1 USB device number 4 using xhci-hcd [ 435.197429] usb 2-1: device firmware changed [ 435.205171] usb 2-1: USB disconnect, device number 4 [ 435.388251] usb 2-1: new SuperSpeed Gen 1 USB device number 5 using xhci-hcd [ 435.409284] usb 2-1: New USB device found, idVendor=1286, idProduct=204e, bcdDevice=32.01 [ 435.409293] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 435.409299] usb 2-1: Product: Bluetooth and Wireless LAN Composite Device [ 435.409303] usb 2-1: Manufacturer: Marvell [ 435.409308] usb 2-1: SerialNumber: 8C1F6469DAD2 [ 435.421408] USB probe: idVendor=1286 idProduct=204e bInterfaceNumber=0 [ 435.421523] VID/PID = 1286/204E, Boot2 version = 3201 [ 435.421537] woal_usb_probe: invalid endpoint assignment [ 435.421972] USB probe: idVendor=1286 idProduct=204e bInterfaceNumber=0 [ 435.422025] VID/PID = 1286/204E, Boot2 version = 3201 [ 435.422038] woal_usb_probe: invalid endpoint assignment [ 435.423075] USB probe: idVendor=1286 idProduct=204e bInterfaceNumber=0 [ 435.423095] VID/PID = 1286/204E, Boot2 version = 3201 [ 435.423123] Attach moal handle ops, card interface type: 0x404 [ 435.423145] rps set to 0 from module param [ 435.423157] No module param cfg file specified [ 435.423179] rx_work=1 cpu_num=8 [ 435.423193] Enable moal_recv_amsdu_packet [ 435.423228] Attach mlan adapter operations.card_type is 0x404. [ 435.425589] WLAN FW is active [ 435.425712] Download txpwrlimit_cfg=nxp/sparrow_power.bin [ 435.425916] Request firmware: nxp/WlanCalData_ext_sparrow_default.conf [ 435.593367] fw_cap_info=0x185cbfa3, dev_cap_mask=0xffffffff [ 435.593393] max_p2p_conn = 8, max_sta_conn = 10 [ 435.619603] Register NXP 802.11 Adapter mlan0 [ 435.619695] wlan: uap%d set max_mtu 2000 [ 435.622776] Register NXP 802.11 Adapter uap0 [ 435.623087] wlan: version = USB8997---16.197.121.p2-MX5X16505.p7.2-(FP197) [ 435.641209] IPv6: ADDRCONF(NETDEV_UP): mlan0: link is not ready [ 435.743762] wlan: mlan0 START SCAN [ 438.940152] wlan: SCAN COMPLETED: scanned AP count=21 [ 438.948662] wlan: HostMlme mlan0 send auth to bssid 82:XX:XX:XX:1e:03 [ 438.957472] mlan0: [ 438.957479] wlan: HostMlme Auth received from 82:XX:XX:XX:1e:03 [ 438.998547] wlan: HostMlme mlan0 Connected to bssid 82:XX:XX:XX:1e:03 successfully [ 439.105657] mlan0: [ 439.105663] wlan: Send EAPOL pkt to 82:XX:XX:XX:1e:03 [ 439.118805] mlan0: [ 439.118811] wlan: Send EAPOL pkt to 82:XX:XX:XX:1e:03 [ 439.122028] IPv6: ADDRCONF(NETDEV_CHANGE): mlan0: link becomes ready [ 450.142651] CAM_INFO: CAM-CRM: __cam_req_mgr_find_dev_name: 209 Skip Frame: req: 13272 not ready on link: 0x1e0117 for pd: 2 dev: cam-sensor open_req count: 2 [ 452.679713] CAM_INFO: CAM-CRM: __cam_req_mgr_find_dev_name: 209 Skip Frame: req: 13347 not ready on link: 0x1e0117 for pd: 2 dev: cam-sensor open_req count: 3 [ 454.406150] msm_vidc: err : ffffffff: .....: DBLP Set: status 0 [ 454.415602] CAM_INFO: CAM-CRM: __cam_req_mgr_find_dev_name: 209 Skip Frame: req: 13398 not ready on link: 0x1e0117 for pd: 2 dev: cam-sensor open_req count: 2 [ 455.350340] CAM_INFO: CAM-CRM: __cam_req_mgr_find_dev_name: 209 Skip Frame: req: 13425 not ready on link: 0x1e0117 for pd: 2 dev: cam-sensor open_req count: 2

If I now run voxl-wifi and enter the same settings, the wifi will come back online. I was able to reproduce this issue several times.