Load the driver, bring it up, capture frames with tcpdump
Load the driver as follows:
```
make -C /usr/src/sys/modules/rtwnfw load
make -C /usr/src/sys/modules/rtwn load
make -C /usr/src/sys/modules/rtwn_pci load
```
This should create an rtwn0 device. Create the wlan0 interface by running:
```
ifconfig wlan0 create wlandev rtwn0 wlanmode monitor channel 6:g
ifconfig wlan0 up
```
Adjust the WiFi channel to a local channel. Then I run this command to start receiving data.
```
tcpdump -n -i wlan0 -y IEEE802_11_RADIOreceiving data.
```
As cited, if you bring the interface down and up, the tcpdump command inconsistently fails to receive data or receives data in sporadic bursts. This is due to the changes in 960c0f3d880f9767027c05614f2184ce4b93fa99.tcpdump -n -i wlan0 -y IEEE802_11_RADIO