Simultaneous hostapd and wpa_supplicant on QCA9880

Ann Lo annlo at
Wed Aug 5 10:08:44 PDT 2015


Has anyone succeeded in running hostapd and wpa_supplicant at the same
time on a single QCA9880? I have not been able to. Does anyone have any
luck with this?

The software/firmware I use:

- Linux kernel 3.16.0-34-generic
- firmware-2 version 10.1.467.2-1
- wpa_supplicant version 2.1
- hostapd version 2.4


- iw dev wlan4 interface add clientwlan type managed
- iw dev wlan4 interface add apwlan type __ap
- ip link set clientwlan address 04:f0:21:16:04:b0
- ip link set apwlan address 04:f0:21:16:04:b1
- ifconfig clientwlan up
- ifconfig apwlan up netmask
- wpa_supplicant -iclientwlan -Dnl80211 -c wpa.test.conf
- hostapd -d hostapd-test.conf
- Both wpa_supplicant and hostapd use the same channel.


(1) If wpa_supplicant is executed before hostapd, wpa_supplicant comes
     up OK but hostapd fails with the following errors:
     - nl80211: Beacon set failed: -16 (Device or resource busy)
     - Failed to set beacon parameters

(2) If hostapd is executed before wpa_supplicant, hostapd comes up OK
     but wpa_supplicant fails with the following errors:
     - nl80211: send_and_recv->nl_recvmsgs failed: -33
     - clientwlan: SME: Trying to authenticate with 00:03:07:12:34:56
(SSID='dd-wrt-ath1' freq=5220 MHz)
     - clientwlan: SME: Authentication request to the driver failed

Using the same configuration files, wpa_supplicant is able to connect
to the remote AP if hostapd is not executed. Similarly, hostapd is able
to provide service to the remote client if wpa_supplicant is not executed.
I have also tried configurations without any security. Same errors as
above when running hostapd and wpa_supplicant at the same time.

I have exhausted all information I could find from the web. According
to this link (, there is the
suggestion that HW encryption cannot work with multiple virtual
interfaces. In one of my tests, I have disabled security altogether by
using "key_mgmt=NONE" in the configuration file for wpa_supplicant.
It is not clear why there continues to be an error "Authentication
request to the driver failed".

Would you provide your expert opinions on this matter if you have the


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