Wi-Fi direct allows concurrent connection of a P2P device to a router
and to a P2P network as a group owner or P2P client. Using
wpa_supplicant v. 2.5 I managed to create a group with p2p_group_add
and then connect with an Android tablet. Separately I also managed to
connect to a wireless router. I did not succeed in having the two
connections simultaneously, with neither a Raspberry PI USB dongle nor
with a Netgear one.
Question 1: does wpa_supplicant support concurrent P2P connection as
described above?
Question 2: With a Google search I came across some blog/forum
accounts of people that managed to have concurrent connections to a
router (as a client) and to devices (as an AP) with the same Wi-Fi
dongle. To achieve this they run simultaneously hostapd (to create an
AP) and wpa_supplicant (to connect to a router). I have not tried this
yet. My question is what are the advantages/disadvantages of this
approach as compared with using P2P as I described above?
-----------
P. S. “iw list” and “dmesg” output for a Raspberry PI USB dongle based
on a Broadcom chipset is below.
# iw list
Wiphy phy3
max # scan SSIDs: 10
max scan IEs length: 2048 bytes
max # sched scan SSIDs: 0
max # match sets: 0
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Device supports roaming.
Supported Ciphers:
* WEP40 (00-0f-ac:1)
* WEP104 (00-0f-ac:5)
* TKIP (00-0f-ac:2)
* CCMP (00-0f-ac:4)
Available Antennas: TX 0 RX 0
Supported interface modes:
* IBSS
* managed
* AP
* P2P-client
* P2P-GO
* P2P-device
Band 1:
Capabilities: 0x1022
HT20/HT40
Static SM Power Save
RX HT20 SGI
No RX STBC
Max AMSDU length: 3839 bytes
DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: 16 usec (0x07)
HT TX/RX MCS rate indexes supported: 0-7
Bitrates (non-HT):
* 1.0 Mbps
* 2.0 Mbps (short preamble supported)
* 5.5 Mbps (short preamble supported)
* 11.0 Mbps (short preamble supported)
* 6.0 Mbps
* 9.0 Mbps
* 12.0 Mbps
* 18.0 Mbps
* 24.0 Mbps
* 36.0 Mbps
* 48.0 Mbps
* 54.0 Mbps
Frequencies:
* 2412 MHz [1] (20.0 dBm)
* 2417 MHz [2] (20.0 dBm)
* 2422 MHz [3] (20.0 dBm)
* 2427 MHz [4] (20.0 dBm)
* 2432 MHz [5] (20.0 dBm)
* 2437 MHz [6] (20.0 dBm)
* 2442 MHz [7] (20.0 dBm)
* 2447 MHz [8] (20.0 dBm)
* 2452 MHz [9] (20.0 dBm)
* 2457 MHz [10] (20.0 dBm)
* 2462 MHz [11] (20.0 dBm)
* 2467 MHz [12] (disabled)
* 2472 MHz [13] (disabled)
* 2484 MHz [14] (disabled)
Supported commands:
* new_interface
* set_interface
* new_key
* start_ap
* join_ibss
* set_pmksa
* del_pmksa
* flush_pmksa
* remain_on_channel
* frame
* set_channel
* start_p2p_device
* crit_protocol_start
* crit_protocol_stop
* connect
* disconnect
Supported TX frame types:
* managed: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70
0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
* P2P-client: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70
0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
* P2P-GO: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70
0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
* P2P-device: 0x00 0x10 0x20 0x30 0x40 0x50 0x60 0x70
0x80 0x90 0xa0 0xb0 0xc0 0xd0 0xe0 0xf0
Supported RX frame types:
* managed: 0x40 0xd0
* P2P-client: 0x40 0xd0
* P2P-GO: 0x00 0x20 0x40 0xa0 0xb0 0xc0 0xd0
* P2P-device: 0x40 0xd0
software interface modes (can always be added):
valid interface combinations:
* #{ managed } <= 1, #{ P2P-device } <= 1, #{
P2P-client, P2P-GO } <= 1,
total <= 3, #channels <= 1
* #{ managed } <= 1, #{ AP } <= 1, #{ P2P-client } <=
1, #{ P2P-device } <= 1,
total <= 4, #channels <= 1
Device supports scan flush.
# dmesg
[32471.157026] usb 1-3: new high-speed USB device number 4 using ehci-pci
[32471.273873] usb 1-3: New USB device found, idVendor=0a5c, idProduct=bd1e
[32471.273882] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[32471.273888] usb 1-3: Product: Remote Download Wireless Adapter
[32471.273892] usb 1-3: Manufacturer: Broadcom
[32471.273895] usb 1-3: SerialNumber: 000000000001
[32471.551505] brcmfmac: brcmf_c_preinit_dcmds: Firmware version =
wl0: Apr 3 2014 04:43:32 version 6.10.198.66 (r467479) FWID
01-32bd010e
[32496.612576] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[32497.762949] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[33813.857788] brcmfmac: brcmf_inetaddr_changed: fail to get arp ip
table err:-23
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