incubator-nuttx/tools/simwifi

# Function

The simwifi can provides host Settings for sim wifi on nuttx sim emulator.
The script sim_wifi.sh supports two modes that simulate wifi, HWSIM and RNC
(real network card).

 - In the HWSIM mode, we simulates two wlan interfaces. The wlan0 is STA and
   the wlan1 is AP. The wlan0 can connect to the wlan1 in the nuttx simulator.
 - In the RNC mode, we can use the same wlan interface name on the nuttx simulator
   to control the connection behavior of the real wireless card.

# Config

Before using the Sim WiFi function, we need to perform the following
configurations:

  - nuttx
  SIM_NETDEV_NUMBER=3
  SIM_WIFIDEV_NUMBER=2
  SIM_NETDEV_TAP=y
  DRIVERS_IEEE80211=y
  NETDEV_WIRELESS_HANDLER=y

  - apps
  WIRELESS_WAPI_CMDTOOL=y
  SYSTEM_DHCPC_RENEW=y
  NETUTILS_DHCPD=y

# Using

We can use the './tools/simwifi/sim_wifi.sh help' command to view the commands
provided by the sim_wifi.sh script and the results are as follows.

sim_wifi.sh (rename <old> <new> |
     init <wan> <mode> |clean |
     start_wpa <wlan0> |stop_wpa |
     start_hostapd <wlan0> |stop_hostapd |
     start_udhcpc <wlan0> |stop_udhcpc |
     start_dhcp <wlan0> |stop_dhcp |
     start_hwsim |stop_hwsim |up_hwsim |
     start_net <wlan0> |stop_net <wlan0> |
     start_sta <wlan0> |stop_sta |
     start_ap <wlan0> [eth0] |stop_ap <wlan0> [eth0] |
     start_bridge <eth0> |stop_bridge <eth0> |
     show | help)

  - Init the simwifi, the command format is as follows:
    sudo ./tools/simwifi/sim_wifi.sh init <wan> <mode>

    The <wan> is the name of the interface for accessing the Internet.
    The <mode> is the simwifi mode, HWSIM and RNC.

    Setting HWSIM:
    sudo ./tools/simwifi/sim_wifi.sh init eno1 HWSIM

    Setting RNC:
    sudo ./tools/simwifi/sim_wifi.sh init eno1 RNC

  - In HWSIM mode:
    Start the hwsim services, the command is as follows.
    sudo ./tools/simwifi/sim_wifi.sh start_hwsim

    Stop the hwsim services, the command is as follows
    sudo ./tools/simwifi/sim_wifi.sh stop_hwsim


  - In RNC mode:
    Maybe the real wireless card name format is not wlanx, in this case
    we need to change it to wlanx format. The command is as follows
    sudo simwifi rename <old_name> wlanx

    * Set the real wireless network card to STA mode.
      sudo ./tools/simwifi/sim_wifi.sh start_sta wlan0

    * Set the real wireless network card to AP mode.
      sudo ./tools/simwifi/sim_wifi.sh start_ap wlan0

Finally we can clean up all the files, configurations and services of the simwifi.
    sudo ./tools/simwifi/sim_wifi.sh clean

# Location problems
   We can use the following command to locate the problem and display the
   status.
 cmd: sudo ./tools/simwifi/sim_wifi.sh show
 log:

/var/run/simwifi
dnsmasq.conf	hostapd       simwifi.log    udhcpc.script	  wpa_supplicant.pid
dnsmasq.leases	hostapd.conf  simwifi.state  wpa_supplicant
dnsmasq.pid	simwifi.conf  udhcpc.pid     wpa_supplicant.conf

services list
root     1880671    2046  0 10月10 ?      00:00:00 /usr/sbin/wpa_supplicant -B -c /var/run/simwifi/wpa_supplicant.conf -iwlan0 -P /var/run/simwifi/wpa_supplicant.pid
nobody   1880680    2046  0 10月10 ?      00:00:00 /usr/sbin/dnsmasq -inuttx0 -C /var/run/simwifi/dnsmasq.conf --log-debug -x /var/run/simwifi/dnsmasq.pid
root     1880672    2046  0 10月10 ?      00:00:00 /usr/sbin/udhcpc -i wlan0 -p /var/run/simwifi/udhcpc.pid -s /var/run/simwifi/udhcpc.script

bridge nuttx0
222: tap0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master nuttx0 state UNKNOWN mode DEFAULT group default qlen 1000
    link/ether 2e:b0:bc:79:41:02 brd ff:ff:ff:ff:ff:ff
223: tap1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop master nuttx0 state DOWN mode DEFAULT group default qlen 1000
    link/ether a6:33:96:26:a4:1d brd ff:ff:ff:ff:ff:ff

default config
defwan:eno1
mode:rnc

state:SW_STA
wlan:wlan0
br:nuttx0

default via 10.221.127.254 dev eno1 proto dhcp metric 100
10.0.1.0/24 dev nuttx0 proto kernel scope link src 10.0.1.1
10.221.96.0/19 dev eno1 proto kernel scope link src 10.221.108.5 metric 100