Introduce telegram bot service (#772)

* introduce telgram bot service

* move bot daemon to scripts, use full path to call jq, use infinite while instead of watch

* fix typo

firmware_mod/controlscripts/telegram-bot

@@ -0,0 +1,53 @@
+#!/bin/sh
+
+######### Bot commands #########
+# /mem - show memory information
+# /shot - take a shot
+# /on - motion detect on
+# /off - motion detect off
+
+PIDFILE="/run/telegram-bot.pid"
+
+if [ ! -f /system/sdcard/config/telegram.conf ]; then
+  echo "You have to configure telegram first. Please see /system/sdcard/config/telegram.conf.dist for further instructions"
+fi
+
+status()
+{
+  pid="$(cat "$PIDFILE" 2>/dev/null)"
+  if [ "$pid" ]; then
+    kill -0 "$pid" >/dev/null && echo "PID: $pid" || return 1
+  fi
+}
+
+start()
+{
+  if [ -f $PIDFILE ]; then
+    echo "Bot already running";
+  else
+    echo "Starting bot"
+    /system/sdcard/bin/busybox nohup /system/sdcard/scripts/telegram-bot-daemon.sh >/dev/null 2>&1 &
+    echo "$!" > "$PIDFILE"
+  fi
+}
+
+stop()
+{
+  pid="$(cat "$PIDFILE" 2>/dev/null)"
+  if [ "$pid" ]; then
+    kill -9 "$pid"
+    rm "$PIDFILE"
+    echo "Bot stopped"
+  else
+    echo "Could not find a bot to stop."
+  fi
+}
+
+if [ $# -eq 0 ]; then
+  start
+else
+  case $1 in start|stop|status)
+      $1
+      ;;
+  esac
+fi