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You are here: Home » Detect Samsung Smartwatch BLE and Trigger IBM Watson IoT Event

By Abhishek Ghosh March 17, 2020 6:14 pm Updated on March 17, 2020

Detect Samsung Smartwatch BLE and Trigger IBM Watson IoT Event

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We can trigger ESP32 to send message to IBM Watson IoT in Presence of a Particular Samsung Galaxy Smartwatch. This involves BLE and WiFi. In our one series of articles on Samsung Smartwatch as Proximity Switch, we triggered a local event, such as control of a relay. In our other series of articles, we sent message to IBM Watson IoT with upon pressing a button (this guide and this guide).

Now, we can combine the two projects so that ESP32 will connect with IBM Watson IoT when a particular Samsung Smartwatch will come closer to it. That is great for some automation which we can not handle locally, like sending a text message or an Email. This is the working code :

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#include "BLEDevice.h"
#include <WiFi.h>
#include <WiFiMulti.h>
#include <HTTPClient.h>
#include <base64.h>
#define USE_SERIAL Serial
 
const char* ssid = "your-hotspot";
const char* password = "password-of-hotspot";
 
#define ORG "paste-it-here"
#define DEVICE_TYPE "DevBoard" //change
#define DEVICE_ID "ESP32" // change
#define TOKEN "your-token"
#define EVENT "myEvent" // example
 
// <------- CHANGE PARAMETERS ABOVE THIS LINE ------------>
 
String urlPath = "/api/v0002/device/types/" DEVICE_TYPE "/devices/" DEVICE_ID "/events/" EVENT;
String urlHost = ORG ".messaging.internetofthings.ibmcloud.com";
int urlPort = 8883;
String authHeader;
 
static BLEAddress *pServerAddress;
BLEScan* pBLEScan;
BLEClient*  pClient;
bool deviceFound = false;
bool LEDoff = false;
bool BotonOff = false;
String knownAddresses[] = { "e0:a1:07:b7:0b:95"}; // change the MAC
unsigned long entry;
 
static void notifyCallback(
  BLERemoteCharacteristic* pBLERemoteCharacteristic,
  uint8_t* pData,
  size_t length,
  bool isNotify) {
  Serial.print("Notify callback for characteristic ");
  Serial.print(pBLERemoteCharacteristic->getUUID().toString().c_str());
  Serial.print(" of data length ");
  Serial.println(length);
}
 
class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks {
    void onResult(BLEAdvertisedDevice Device){
      // show the MAC of other BLE devices
      //Serial.print("BLE Advertised Device found: ");
      //Serial.println(Device.toString().c_str());
      pServerAddress = new BLEAddress(Device.getAddress());
      bool known = false;
      bool Master = false;
      for (int i = 0; i < (sizeof(knownAddresses) / sizeof(knownAddresses[0])); i++) {
        if (strcmp(pServerAddress->toString().c_str(), knownAddresses[i].c_str()) == 0)
          known = true;
      }
      if (known) {
        Serial.print("Our device found!");
        Serial.print("Device distance:");
        Serial.println(Device.getRSSI());
        // adjust the value. -85 is medium distance
        // -60 is closer than -85
        if (Device.getRSSI() > -85) {
          deviceFound = true;
        }
        else {
          deviceFound = false;
        }
        Device.getScan()->stop();
        delay(100);
      }
    }
};
void setup() {
  Serial.begin(115200);
  BLEDevice::init("");
  pClient  = BLEDevice::createClient();
  pBLEScan = BLEDevice::getScan();
  pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks());
  pBLEScan->setActiveScan(true);
   initWifi();
   authHeader = "Authorization: Basic " + base64::encode("use-token-auth:" TOKEN) + "\r\n";
  Serial.println("Done");
}
void Bluetooth() {
  Serial.println();
  Serial.println("BLE Scan restarted.....");
  deviceFound = false;
  BLEScanResults scanResults = pBLEScan->start(5);
  if (deviceFound) {
    Serial.println("Found");
    doWiFiClientSecure();
    delay(10000);
  }
  else{
    Serial.println("Device is not closer");
  }
}
void loop() {
  Bluetooth();
}
 
void doWiFiClientSecure() {
WiFiClientSecure client;
Serial.print("connect: "); Serial.println(urlHost);
while ( ! client.connect(urlHost.c_str(), urlPort)) {
    Serial.print(".");
}
Serial.println("Connected");
String postData = String("{  \"d\": {\"aMessage\": \"") + millis()/1000 + "\"}  }";
String msg = "POST " + urlPath + " HTTP/1.1\r\n"
                "Host: " + urlHost + "\r\n"
                "" + authHeader + ""
                "Content-Type: application/json\r\n"
                "Content-Length: " + postData.length() + "\r\n"
                "\r\n" + postData;
                
client.print(msg);
Serial.print(msg);
 
Serial.print("\n*** Request sent, receiving response...");
while (!!!client.available()) {
    delay(50);
Serial.print(".");
  }
  
Serial.println();
Serial.println("Got response");  
  while(client.available()){
  Serial.write(client.read());
  }
Serial.println(); Serial.println("closing connection");
  client.stop();
}
 
void initWifi() {
  Serial.print("Connecting to: "); Serial.print(WiFi.SSID());
  WiFi.mode(WIFI_STA);  
  WiFi.begin(ssid, password);  
  while (WiFi.status() != WL_CONNECTED) {
     delay(250);
     Serial.print(".");
  }
  
  Serial.println("");
  Serial.print("WiFi connected, IP address: "); Serial.println(WiFi.localIP());
 
}

NOTE : You need to follow this guide to enable Arduino IDE to upload this large code on ESP32. Else you’ll face “Sketch Too Big” error! This code will consume 85% space. So, we have some more space to upgrade the code in future.

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The above code, in presence of the particular smartwatch will give this output on serial monitor :

Detect Samsung Smartwatch BLE and Trigger IBM Watson IoT Event

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Connected
POST /api/v0002/device/types/DevBoard/devices/ESP32/events/myEvent HTTP/1.1
Host: tko2rj.messaging.internetofthings.ibmcloud.com
Authorization: Basic dXNlLXRva2VuLWF1dGg6YihONHFQM0BMeCF5ZGFvaUVN
Content-Type: application/json
Content-Length: 28
 
{  "d": {"aMessage": "5"}  }
*** Request sent, receiving response...................
Got response
HTTP/1.1 200 OK
Server: IBM WIoTP Message Gateway
Date: Tue, 17 Mar 2020 17:35:52 GMT
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
Connection: keep-alive
Keep-Alive: timeout=60
Cache-Control: no-cache
Content-Type: text/plain;charset=utf-8
Content-Length: 0
 
 
closing connection

And this debug information on your IBM Watson IoT’s log :

Samsung Smartwatch BLE Trigger IBM Watson IoT Event

If the device is absent, then you’ll get :

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BLE Scan restarted.....
The device is not closer
 
BLE Scan restarted.....
The device is not closer
 
BLE Scan restarted.....
The device is not closer

We had a GitHub repository with all sample codes for IBM Watson IoT we have created. We have added the above code to the repository as smartwatch-BLE-switch.ino.

This code can be advanced with distance measurement data and applied in real-life with car, garage door and so on to automatically notify the family members.

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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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About This Article

Cite this article as: Abhishek Ghosh, "Detect Samsung Smartwatch BLE and Trigger IBM Watson IoT Event," in The Customize Windows, March 17, 2020, April 1, 2023, https://thecustomizewindows.com/2020/03/detect-samsung-smartwatch-ble-and-trigger-ibm-watson-iot-event/.

Source:The Customize Windows, JiMA.in

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