SCUHU: configure SCUHU and add services and scripts to run at startup on pi

This is so that the software required for SCUHU will run at startup on the pi.

Approved-by: Alan Noble
Approved-by: Saxon Milton

exp/rvcl/config-scuhu.json

@@ -0,0 +1,14 @@
+{
+    "BitDepth": "16",
+    "Channels": "1",
+    "Input": "audio",
+    "InputCodec": "pcm",
+    "MaxFileSize": "172800000",
+    "Output": "File",
+    "OutputPath": "/home/pi/recordings/audio-",
+    "RecPeriod": "1",
+    "SampleRate": "48000",
+    "logging": "Debug",
+    "mode": "Normal",
+    "PSITime": "10"
+}

scripts/scuhu.service

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+[Unit]
+Description=Startup service for SCUHU, primarily configures and runs rvcl to record audio to file.
+
+[Service]
+Type=simple
+ExecStart=/home/pi/go/src/bitbucket.org/ausocean/av/scripts/scuhu_run.sh
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target

scripts/scuhu_run.sh

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+#!/bin/sh -e
+# This script configures and runs a binary on a pi, intended to run at boot time.
+BINNAME=rvcl
+ARGS="-config-file config-scuhu.json"
+
+echo Set kernel parameters:
+# kernel settings to improve performance on Raspberry Pi
+# tell Linux to fork optimistically
+sudo sysctl -w vm.overcommit_memory=1
+# minimize swapping, without disabling it completely
+sudo sysctl -w vm.swappiness=1
+
+# turn off the pi LED to conserve power
+echo default-on | sudo tee /sys/class/leds/led0/trigger
+echo none | sudo tee /sys/class/leds/led0/trigger
+
+# the following required directories _should_ already exist
+if [ ! -d /var/log/netsender ]; then
+  sudo mkdir /var/log/netsender
+  chmod guo+rwx /var/log/netsender
+fi
+if [ ! -d /var/netsender ]; then
+  sudo mkdir /var/netsender
+  chmod guo+rwx /var/netsender
+fi
+
+# show IP addresses
+echo Our IP addresses:
+sudo ip addr show | grep inet
+
+# capture stdout and stderr to a secondary log file (just in case)
+exec 2> /var/log/netsender/stream.log
+exec 1>&2
+
+# set env, working dir and run as pi user
+HOME=/home/pi
+GOPATH=$HOME/go
+BINPATH=$GOPATH/src/bitbucket.org/ausocean/av/exp/$BINNAME
+PATH=$PATH:/usr/local/go/bin:$BINPATH
+cd $BINPATH
+sudo HOME=$HOME GOPATH=$GOPATH PATH=$PATH ./$BINNAME $ARGS
+if [ $? -eq 0 ]
+then
+  echo "Successfully exited $BINNAME"
+  exit 0
+else
+  echo "$BINNAME exited with code: $?" >&2
+  exit 1
+fi

scripts/wifi-off-delay.service

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+[Unit]
+Description=Used to turn the pi's wifi off after a set delay after startup.
+
+[Service]
+Type=simple
+ExecStart=/home/pi/go/src/bitbucket.org/ausocean/av/scripts/wifi-off-delay_run.sh
+Restart=on-failure
+
+[Install]
+WantedBy=multi-user.target

scripts/wifi-off-delay_run.sh

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+#!/bin/sh
+
+#This script is intended to run at startup and will turn the wifi interface off if it has not connected to an SSID in 5 minutes.
+
+sleep 300
+
+if iwconfig wlan0 | grep -q "ESSID:off/any"; then
+    sudo ifconfig wlan0 down
+fi