From e06b837b3b3ec837665eb7c0539636c7b000664a Mon Sep 17 00:00:00 2001
From: Roman Bazalevskiy <rvb@rvb.name>
Date: Sun, 19 Mar 2017 22:53:22 +0300
Subject: [PATCH] BLE Beacon scan - initial support fro iBeacons

---
 mqtt-bt/scan-beacons | 121 +++++++++++++++++++++++++++++++++++++++----
 1 file changed, 110 insertions(+), 11 deletions(-)

diff --git a/mqtt-bt/scan-beacons b/mqtt-bt/scan-beacons
index 747c295..98c3993 100644
--- a/mqtt-bt/scan-beacons
+++ b/mqtt-bt/scan-beacons
@@ -1,5 +1,67 @@
 #!/usr/bin/env lua
 
+function getConfig(configname)
+
+  local uci=require("uci")
+  local cur=uci.cursor()
+  local config
+  if configname then
+    config=configname
+  else
+    config="beacon"
+  end
+
+  logging = cur.get(config,"logging","enabled") 
+
+  mqtt_host = cur.get(config,"mqtt","host")
+  mqtt_port = cur.get(config,"mqtt","port")
+  mqtt_id = cur.get(config,"mqtt","id")
+  mqtt_topic = cur.get(config,"mqtt","topic")
+
+  mqtt_user = cur.get(config,"mqtt","user")
+  mqtt_passwd = cur.get(config,"mqtt","password")
+
+  if mqtt_host and not mqtt_id then
+    mqtt_id="beaconmon"
+  end
+
+  if mqtt_host and not mqtt_port then
+    mqtt_port = 1883
+  end
+
+  if mqtt_host and not mqtt_topic then
+    mqtt_topic = 'beaconmon/{type}/{details}'
+  end
+
+end
+
+function capture(cmd, raw)
+  local f = assert(io.popen(cmd, 'r'))
+  local s = assert(f:read('*a'))
+  f:close()
+  if raw then return s end
+  s = string.gsub(s, '^%s+', '')
+  s = string.gsub(s, '%s+$', '')
+  s = string.gsub(s, '[\n\r]+', ' ')
+  return s
+end
+
+function mqtt_encode(str)
+  if (str) then
+    str = string.gsub (str, "\n", "")
+    str = string.gsub (str, "/", "-")
+  end
+  return str	
+end
+
+function printLog(str)
+  if logging=="on" then
+    capture("logger -t beaconmon "..str)
+  else 
+    print(str)  
+  end 
+end
+
 function run_command(cmd)
 
   local file = assert(io.popen(cmd, 'r'))
@@ -40,8 +102,19 @@ end
 
 function process_packet(packet)
 
-  bytes={}
-  idx=1
+  local bytes={}
+  local idx=1
+  local len
+  local mac
+  local flags
+  local power
+  local tx
+  local type
+  local paysublen
+  local uuid
+  local major
+  local minor
+  local details
 
   if packet:len()>1 then
 
@@ -59,17 +132,17 @@ function process_packet(packet)
       flags=bytes[14]
       power=tonumber("0x"..bytes[len-1])-256
       tx=tonumber("0x"..bytes[len])-256
-      j = 15
+      local j = 15
       while j<len-2 do
         paysublen=tonumber('0x'..bytes[j])
 	if bytes[j+1]=="FF" and bytes[j+2]=="4C" and bytes[j+3]=="00" and bytes[j+4]=="02" and bytes[j+5]=="15" then
 	  -- Standard UUID iBeacon
           type="ibeacon"
-	  uuid1=bytes[j+6]..bytes[j+7]..bytes[j+8]..bytes[j+9]
-	  uuid2=bytes[j+10]..bytes[j+11]
-	  uuid3=bytes[j+12]..bytes[j+13]
-	  uuid4=bytes[j+14]..bytes[j+15]
-	  uuid5=bytes[j+16]..bytes[j+17]..bytes[j+18]..bytes[j+19]..bytes[j+20]..bytes[j+21]
+	  local uuid1=bytes[j+6]..bytes[j+7]..bytes[j+8]..bytes[j+9]
+	  local uuid2=bytes[j+10]..bytes[j+11]
+	  local uuid3=bytes[j+12]..bytes[j+13]
+	  local uuid4=bytes[j+14]..bytes[j+15]
+	  local uuid5=bytes[j+16]..bytes[j+17]..bytes[j+18]..bytes[j+19]..bytes[j+20]..bytes[j+21]
 	  uuid=string.lower(uuid1..'-'..uuid2..'-'..uuid3..'-'..uuid4..'-'..uuid5)
           major=bytes[j+23]..bytes[j+22]
           minor=bytes[j+25]..bytes[j+24]
@@ -77,10 +150,26 @@ function process_packet(packet)
         j=j+1+paysublen
       end
       if type=="ibeacon" then
-        print(string.format("{type:'ibeacon',mac:'%s',uuid:'%s',major:'%s',minor:'%s',power:%d,tx:%d}",mac,uuid,major,minor,power,tx))
+        printLog(string.format("{type:'ibeacon',mac:'%s',uuid:'%s',major:'%s',minor:'%s',power:%d,tx:%d}",mac,uuid,major,minor,power,tx))
+        details=uuid..'/'..major..'/'..minor..'/'
       else
-        print(dump(bytes))
+        type='unknown'
+        details=dump(bytes)
+        printLog(details)
       end
+      if mqtt_client then
+        mqtt_path=string.gsub(mqtt_topic,"{(.-)}", 
+          function (name) 
+            if name=="type" then
+              return mqtt_encode(type)
+            elseif name=="details" then
+              return mqtt_encode(details)
+            else
+              return '{'..name..'}'
+            end      
+          end)
+        mqtt_client:publish(mqtt_path,tx)
+      end        
     end
   end
 
@@ -118,6 +207,16 @@ function read_loop()
 
 end
 
-inp = open_dump()
+getConfig(arg[1])
+
+if mqtt_host then
+  MQTT = require "paho.mqtt"
+  mqtt_client = MQTT.client.create(mqtt_host, mqtt_port)
+  if mqtt_user then
+    mqtt_client:auth(mqtt_user, mqtt_passwd)
+  end
+  mqtt_client:connect(mqtt_id)
+end
 
+inp = open_dump()
 read_loop()
-- 
2.34.1