Mapwize

Last modified by Xiaoling on 2023/04/23 15:31

     Table of Contents：

1.  Introduction

This article shows how to use LBT1 to build an Indoor Positioning Solution.

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LBT1 Indoor Positioning Network Structure

2.  Prepare Map

2.1  Prepare iBeacons

Any BLE iBeacons should work in this solution, each iBeacon stands for a fix position in the map. Here is an iBeacon for example.

First of all, user needs to accurately place the beacon at each location, which is the reference for positioning.

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BCN01 iBeacon

We need to get the UUID, MAJOR, MINOR, TXPOWER where each iBeacon is placed. We can get it with the iBeacon software, such as "EW-beacon".

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beacon software

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beacon software

2.2  Create Map

Here we use the indoor map at https://studio.mapwize.io/. Below shows the steps for create a map and put the iBeacon on a fix position.

 

1. Register an account at https://studio.mapwize.io/ to create an indoor map.

2. Create Place Types.

 

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Create place types

3. Search Venues. （Indoor map area identification）

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The map accurately places the beacon of ibeacon, which is the reference for positioning. At this time, UUID, MAJOR and MINOR must be filled in correctly.

 

4. Upload Floor plan.

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add images

5. Create Layer

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create layer

6. Add iBeacon position info. Drag the iBeacon to match position and input the UUID, MAJOR and MINOR of this iBeacon.

 

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create iBeacon

3.  Configure TTN

3.1  Configure LBT1 to Upload data to TTN

Please refer the instruction in the User Manual. Note the LBT1 need to set to MOD=3 here.

3.2  Decoder in TTN

function Decoder(bytes, port) {

// Decode an uplink message from a buffer

// (array) of bytes to an object of fields.

value = bytes[0] << 8 | bytes[1];

var batV = value/1000;//Battery,units:V

var mode = bytes[5];

//var value=(bytes[3]-0x30)*1000 +(bytes[5]-0x30)*100 + (bytes[5]-0x30)*10 +(bytes[6]-0x30);

//var value = bytes.slice(3);

var i;

var con;

var str = "";

var major = 1;

var minor = 1;

var rssi = 0;

var addr = "";

if(mode ==2 ) {

  for(i = 38 ; i<50 ; i++) {

   con = bytes[i].toString();

   str += String.fromCharCode(con);

  }

  addr = str;

  str = "";

  for(i = 6 ; i<38 ; i++) {

     con = bytes[i].toString();

     str += String.fromCharCode(con);

  }

  value = str;

}

if(mode == 3 ) {

  str = "";

  for(i = 18 ; i < 22 ; i++) {

     con = bytes[i].toString();

     str += String.fromCharCode(con);

  }

  major = parseInt(str, 16);

  str = "";

  for(i = 22 ; i < 26 ; i++) {

     con = bytes[i].toString();

     str += String.fromCharCode(con);

  }

  minor = parseInt(str, 16);

  str = "";

  for(i = 28 ; i < 32 ; i++) {

     con = bytes[i].toString();

     str += String.fromCharCode(con);

  }

  rssi = parseInt(str);

  str = "";

  for(i = 6 ; i < 18 ; i++) {

     con = bytes[i].toString();

     str += String.fromCharCode(con);
  }

  value = str;
}

if(mode == 1) {

  for(i = 6 ; i<11 ; i++) {

     con = bytes[i].toString();

     str += String.fromCharCode(con);

  }

  value = str;
}

var uuid = value;

var alarm = bytes[2] >> 4 & 0x0F;

var step_count = (bytes[2] & 0x0F) << 16 | bytes[3] << 8 | bytes[4];

return {
  UUID: uuid,
  ADDR: addr,
  MAJOR: major,
  MINOR: minor,
  RSSI:rssi,
  STEP: step_count,
  ALARM: alarm,
  BatV:batV,
};
}
 

4.  Set Up Converter Server

  • How to install and run this service on Linux?

Step1:  Rent a Linux on Amazon cloud or alicloud to the host, and pre install the Linux system (Debian, Ubuntu, CentOS are available for distribution).

Step2:  Run the code on the server after compiling. Compilation requires the support of libcurl. First, compile libmqtt in the code, and then compile location.

 

System:  Debian / Ubuntu

step:

1. sudo apt install libcurl4-dev 

2. sudo apt install  gcc automake autoconf libtool make cmake

3. git clone -b master https://github.com/mikayong/location.git

4. cd location/libmqtt

5. mkdir build

6. cd build && cmake ../

7. make && sudo make install 

8. cd ../

9. make 

10. sudo cp location_conf.json  /etc/

11. Edit the configuration file, and run the location service in the background: ./location &

Step3: The location service subscribes to the lora information stream on TTN through the mqtt protocol, parses the information to generate a geographic location, and finally creates a geographic location on the mapwize map. The following is the configuration of the location service, the configuration file is in json format, the file is /etc/location_conf.json

 

5.  Configuration file： location_conf.json

  • We use the 120.78.138.177 server as an example. The location service is currently installed on the 120.78.138.177 server, the code is in /root/location, and the configuration file for running location pre-read directly is /etc/location_conf.json.

     

{ "location_conf": {

   "loctype": "indoor",       // indoor/outdoor
   "locmap": "mapwize"    //   Map interface: mapwize， traccar

}, "mqtt_conf": {

    "servaddr": "[str]",    //     Lorawan server address: Refer to TTN app handler：eu.thethings.network
    "servport": [int],       //   Lorawan server port: 1883
    "clientid": "[str]",       //   MQTT client identity: Custom
    "qos":[int],                 //  （Optional） MQTT service quality: 0
    "username":"[str]",     //   Agent name of mqtt: application ID of TTN
    "password":"[str]",      //  The proxy password of mqtt: application access key of TTN
    "topic":"[str]",              // The topic of mqtt subscription: TTN is + / devices / + / up
   "connection":"[str]" },   //（Optional） mqtt is a string used for direct connection, composed of serveraddr and port
   "mapwize_conf":{          //Map settings
    "apikey": "[str]",        // The apikey of the map user can be found on the Api keys page of wapwize, and read and write permissions need to be set
   "venueid":"[str]",        // （Optional）Indoor map area identification
    "orgid":"[str]",           //  The identity of the user organizer
   "universesid":"[str]",   //The range indicator of the indoor map, find it on the universes page
   "placetype": "[str]"     //The type of place used to identify the creation must be created on the placetypes page in the map, where the placetype name is filled in
    },
"loracloud":{
   "token":  "[str]"          //The password string of loracloud location service, the outdoor map must fill in the account token of loracloud

}

"rssi_conf": {
   "rssirate": [int],          // （Optional） A basis for rssi calculation distance, the rssi value (absolute value) when the beacon is 1 meter apart 
   "rssidiv": [float] }        // （Optional） rssi measures an attenuation value of distance. As the distance to the beacon is farther, the value changes speed

}

 

  • Parameter acquisition method of configuration file：

"username":"[str]" 

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username

"password":"[str]"      

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password

"apikey": "[str]" 

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apikey

"orgid":"[str]"

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orgid

"universesid":"[str]"

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universesid

"placetype": "[str]"

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placetype

Here are two ways to enter the server：

1. WinSCP

image-20220526152303-18.png

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way1

2. secureCRT

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way2

6.  Test Result

The real-time position on the map is obtained according to the moving change of LBT1.

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