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Update CAR INSTALL.md

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Mike Brady
2018-03-26 12:01:39 +01:00
committed by GitHub
parent f306537a8f
commit 39c6c4a8e7
1 changed files with 7 additions and 12 deletions
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CAR INSTALL.md
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@@ -157,12 +157,6 @@ Second, modify the INTERFACESv4 entry at the end of the file `/etc/default/isc-d
INTERFACESv4="wlan0"
INTERFACESv6=""
```
Third, allow `wlan0` to be configured with a static IP number by removing it from the control of the `dhcpcp` service. Edit `/etc/dhcpcd.conf` and insert the following line at the start:
```
denyinterfaces wlan0
```
(Note that from this point on, at least on the Raspberry Pi, if you reboot the machine, it will not reconnect to your network.)
### Set up the Startup Sequence
Configure the startup sequence by adding commands to `/etc/rc.local` to start `hostapd` and the `dhcp` server and then to start `shairport-sync` automatically after startup. Its contents should look like this:
```
@@ -179,12 +173,6 @@ Configure the startup sequence by adding commands to `/etc/rc.local` to start `h
#
# By default this script does nothing.
# Print the IP address
_IP=$(hostname -I) || true
if [ "$_IP" ]; then
printf "My IP address is %s\n" "$_IP"
fi
/sbin/iw dev wlan0 set power_save off
/usr/sbin/hostapd -B -P /run/hostapd.pid /etc/hostapd/hostapd.conf
/sbin/ip addr add 10.0.10.1/24 dev wlan0
@@ -197,6 +185,13 @@ exit 0
```
As you can see, the effect of these commands is to start the WiFi transmitter, give the base station the IP address `10.0.10.1`, start a DHCP server and finally start the Shairport Sync service.
### Final Steps
Up to now, if you reboot the Pi, it will connect to your WiFi network, ignoring the instruction to act as a base station. That is because the `wlan0` interface is still under the control of the `dhcpcd` service. So, the final step is to instruct the `dhcpcd` service not to manage `wlan0`. To do this, edit `/etc/dhcpcd.conf` and insert the following line at the start:
```
denyinterfaces wlan0
```
From this point on, at least on the Raspberry Pi, if you reboot the machine, it will not reconnect to your network – instead, it will act as a WiFi base station.
### Ready
Install the Raspberry Pi in your car. It should be powered from a source that is switched off when you leave the car, otherwise the slight current drain will eventually flatten the car's battery.