altbeacon_receive

#!/bin/bash

# AltBeacon - The Open and Interoperable Proximity Beacon Specification
#
# Receive Reference Script
#
# System Requirements: Linux, BlueZ (Official Linux Bluetooth protocol stack), Bluetooth 4.0 Adapter

if [[ $1 == "parse" ]]; then
  packet=""
  capturing=""
  while read line
  do
    if [ "$capturing" ]; then
      if [[ $line =~ ^[0-9a-fA-F]{2}\ [0-9a-fA-F] ]]; then
        packet="$packet $line"
      else
        if [[ $packet =~ ^04\ 3E\ 2[AB]\ .{1,99}\ 1B\ FF\ .{5}\ BE\ AC ]]; then # Filter for AltBeacon prefix
	  # Capture identifiers from raw data
	  ID1=`echo $packet | sed 's/^.\{1,99\}\ 1B\ FF\ .\{5\}\ BE\ AC\ \(.\{47\}\).*$/\1/'`
          ID2=`echo $packet | sed 's/^.\{1,99\}\ 1B\ FF\ .\{5\}\ BE\ AC\ .\{47\} \(.\{5\}\).*$/\1/'`
          ID3=`echo $packet | sed 's/^.\{1,99\}\ 1B\ FF\ .\{5\}\ BE\ AC\ .\{53\} \(.\{5\}\).*$/\1/'`
          POWER=`echo $packet | sed 's/^.\{1,99\}\ 1B\ FF\ .\{5\}\ BE\ AC\ .\{59\} \(.\{2\}\).*$/\1/'`
	  RESERVED=`echo $packet | sed 's/^.\{1,99\}\ 1B\ FF\ .\{5\}\ BE\ AC\ .\{62\} \(.\{2\}\).*$/\1/'`
          RSSI=`echo $packet | sed 's/^.\{1,99\}\ 1B\ FF\ .\{5\}\ BE\ AC\ .\{65\} \(.\{2\}\).*$/\1/'`
	  # Convert from raw hex to human readable format
          ID1=`echo $ID1 | sed -e 's/\ //g' -e 's/^\(.\{8\}\)\(.\{4\}\)\(.\{4\}\)\(.\{4\}\)\(.\{12\}\)$/\1-\2-\3-\4-\5/'`
          ID2=`echo $ID2 | sed 's/\ //g'`
          ID2=`echo "ibase=16; $ID2" | bc`
          ID3=`echo $ID3 | sed 's/\ //g'`
          ID3=`echo "ibase=16; $ID3" | bc`
          POWER=`echo "ibase=16; $POWER" | bc`
          POWER=$[POWER - 256]
	  RESERVED=`echo "ibase=16; $RESERVED" | bc`
	  RSSI=`echo "ibase=16; $RSSI" | bc`
	  RSSI=$[RSSI - 256]
          # Display identifiers
    	  echo "ID1: $ID1 ID2: $ID2 ID3: $ID3 POWER: $POWER MFG_RESERVED: $RESERVED RSSI: $RSSI"
        fi
        capturing=""
        packet=""
      fi
    fi
    if [ ! "$capturing" ]; then
      if [[ $line =~ ^\> ]]; then
        packet=`echo $line | sed 's/^>.\(.*$\)/\1/'`
        capturing=1
      fi
    fi
  done
else
  sudo hcitool lescan --duplicates 1>/dev/null &
  lescan_pid=$!
  sudo hcidump --raw | ./$0 parse $1
fi
trap "sudo kill $lescan_pid" EXIT