2022-12-27 03:57:44 +00:00
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2022-12-27
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2022-11-28 20:27:59 +00:00
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What is Concurrent Mode?
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Concurrent Mode creates 2 wireless network interfaces (wlan0, wlan1) and those
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two interfaces share the same WiFi adapter.
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This feature allows performing 2 separate wireless tasks at the same time with a
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single WiFi adapter.
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For example:
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Use station mode (also called managed or client mode) to connect with an
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AP to access the internet at the same time as it also performs as an AP
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to allow other devices to connect to the second interface.
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Note: Only supports 3 combinations
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1. Station mode + Station mode
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2. Station mode + AP mode
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3. Station mode + P2P mode
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Note: Monitor mode is not supported.
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2022-11-28 20:27:59 +00:00
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-----
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How do I Enable Concurrent Mode?
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2022-12-27 03:57:44 +00:00
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Edit the `Makefile` with a text editor:
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```
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nano Makefile
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```
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Change the following line:
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```
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#EXTRA_CFLAGS += -DCONFIG_CONCURRENT_MODE
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```
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to
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```
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EXTRA_CFLAGS += -DCONFIG_CONCURRENT_MODE
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```
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and then install the driver per the installation steps. If
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the driver is already installed, run the following first:
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```
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sudo ./remove-driver.sh
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```
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and then reinstall the driver with:
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2022-11-28 20:27:59 +00:00
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```
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2022-12-27 03:57:44 +00:00
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sudo ./install-driver.sh
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2022-11-28 20:27:59 +00:00
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```
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Once the driver is fully installed and you have rebooted the system, you
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can verify that this works by typing the “iw dev” command. You should
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see two wireless interfaces, and the MAC address of the secondary interface
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is nearly the same as the first except for one digit.
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-----
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FAQ:
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Q: Which wireless interface can run in station mode? Which
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wireless interface can run in AP mode?
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A: It is recommended to run station mode in wlan0 and AP or P2P mode in
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wlan1.
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Q: How is the throughput with 2 wireless interfaces in concurrent mode?
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A: Because there is only one physical hardware device, the two wireless
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interfaces (wlan0, wlan1) will share the transmit bandwidth.
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For example:
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Assume the throughput limitation of current environment is 85Mb/s,
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then the throughput of wlan0 + the throughput of wlan1 is basically
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equal or smaller than 85Mb/s.
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Q: Everything is fine when I only start hostapd, but when I start running
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station mode in the other interface at the same time, hostapd will disconnect
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for a moment then will reconnect again, however ,the channel is differ from
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before. Is something wrong?
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A: Don’t worry, it is fine! As mentioned before, those two wireless interfaces
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share the same physical hardware device. That means those 2 wireless interfaces
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must use the same channel. The AP/P2P interface should use the same channel as
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the station interface. If both interfaces are running in station mode, the
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connected APs MUST be on same channel.
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