TI SensorTag to SAP Cloud Platform IoT Services

Connecting your TI SensorTag to IoT Services

In other tutorials you learn how to add your message type, device type and devices to the IoT Services of the SAP Cloud Platform. If you are not sure of how to do these steps I would recommend you check out the other tutorials associated with the SAP Cloud Platform or check out the developer center for SAP.

The following describes the general procedures necessary to setup your local environment to communicate and work with a Bluetooth TI SensorTag, as well as the coding needed to send data from your SensorTag to the SAP Cloud Platform.

Install the following tools:

• Node.js 4.4.3 or higher

• Install an HTML/JavaScript editor — if you don’t have one, simply search Google for something appropriate like Notepad++, Sublime Text, etc…

• Install the Node.js native add-on build tool from the command prompt (or Terminal) npm install -g node-gyp For more information see Installation instructions

• Install the Node.js SensorTag library from the command prompt (or Terminal) npm install -g sensortag For more information see Installation instructions

• You may also need to check the prerequisites for Noble

Create a new JavaScript file

Next create a new Node.js file called readTags.js

/* 	sensorTag IR Temperature sensor example
*  Craig Cmehil, SAP SE (c) 2015
*/
/* Choose the proper HTTP or HTTPS, SAP Cloud Platformrequires HTTPS */
var http = require('https');
var SensorTag = require('sensortag');
var lv_temp;
var lv_humid;
var lv_deviceid = "";
var DEBUG_VALUE = true;
var xtimestamp;
var date = new Date();
var time = date.getTime ();
// SAP Cloud Platform connection details
var portIoT = 443;
var pathIoT = '/com.sap.iotservices.mms/v1/api/http/data/';
var hostIoT = 'iotmmsXXXXXXXXXXtrial.hanatrial.ondemand.com';
var authStrIoT = 'Bearer XXXXXXXXXXXX';
var deviceId = 'XXXXXX-XXXX-XXXX-XXXX-XXXXXXXXX';
var messageTypeID = 'XXXXXXXXXXXX';
var options = {
    host: hostIoT,
  port: portIoT,
    path: pathIoT + deviceId,
    agent: false,
    headers: {
       'Authorization': authStrIoT,
       'Content-Type': 'application/json;charset=utf-8',
	 'Accept': '*/*'
    },
    method: 'POST',     
};
/***************************************************************/
/* Coding to access TI SensorTag and values of various sensors */
/***************************************************************/
console.log("If not yet activated, then press the power button.");
SensorTag.discover(function(tag) {
tag.on('disconnect', function() {
	console.log('disconnected!');
	process.exit(0);
});
function connectExecute() {
	console.log('Connect Device and Execute Sensors');
	tag.connectAndSetUp(enableSensors);
}
function enableSensors() {
	/* Read device specifics */
	tag.readDeviceName(function(error, deviceName) {
		console.log('Device Name = ' + deviceName);
	});
	tag.readSystemId(function(error, systemId) {
		console.log('System ID = ' + systemId);
		lv_deviceid = systemId;
	});
	tag.readSerialNumber(function(error, serialNumber) {
		console.log('Serial Number = ' + serialNumber);
	});
	tag.readFirmwareRevision(function(error, firmwareRevision) {
		console.log('Firmware Rev = ' + firmwareRevision);
	});
	tag.readHardwareRevision(function(error, hardwareRevision) {
		console.log('Hardware Rev = ' + hardwareRevision);
	});
	tag.readHardwareRevision(function(error, softwareRevision) {
		console.log('Software Revision = ' + softwareRevision);
	});
	tag.readManufacturerName(function(error, manufacturerName) {
		console.log('Manufacturer = ' + manufacturerName);
	});
	/* Enable Sensors */
	console.log("Enabling sensors:");
	console.log('\tenableIRTemperatureSensor');
	tag.enableIrTemperature(notifyMe);
	console.log('\tenableHumidity');
	tag.enableHumidity(notifyMe);
	console.log("*********************************************");
	console.log(" To stop press both buttons on the SensorTag ");
	console.log("*********************************************");
}
function notifyMe() {
	tag.notifySimpleKey(listenForButton);
	setImmediate(function loop () {
		tag.readIrTemperature(function(error, objectTemperature, ambientTemperature){
      		lv_obj = objectTemperature.toFixed(1);
      		lv_ambient = ambientTemperature.toFixed(1);
    		});
		tag.readHumidity(function(error, temperature, humidity) {
			lv_temp = temperature.toFixed(1);
			lv_humid = humidity.toFixed(1);
		});
		if(DEBUG_VALUE)
			console.log("Sending Data: " + lv_deviceid + " " + lv_temp + " " + lv_humid);
		setSensorData(lv_temp, lv_humid);
		setTimeout(loop, 10000);
	});
  }
function listenForButton() {
	tag.on('simpleKeyChange', function(left, right) {
		if (left && right) {
			tag.disconnect();
		}
   });
}
connectExecute();
});
/******************************************************************/
/* FUNCTION to get Temperature from the Sensor & update into HANA */
/******************************************************************/
function setSensorData(lv_temp,lv_humid){
date = new Date();
  time =date.getTime();
var data = {
	"mode":"sync",
	"messageType": messageTypeID,
	"messages": [{
		"timestamp": time,
		"temperature": lv_temp,
		"humidity": lv_humid
	}]
  };
var strData = JSON.stringify(data);
if(DEBUG_VALUE)
	console.log("Data: " + strData);
if(strData.length > 46){
	if(DEBUG_VALUE)
		console.log("Sending Data to server");
	/* Process HTTP or HTTPS request */
	options.agent = new http.Agent(options);
	var request_callback = function(response) {
		var body = '';
		response.on('data', function (data) {
			body += data;
		});
		response.on('end', function () {
			if(DEBUG_VALUE)
				console.log("REQUEST END:", response.statusCode);
		});
		response.on('error', function(e) {
			console.error(e);
		});    
	}
	var request = http.request(options, request_callback);
	request.on('error', function(e) {
		console.error(e);
	});
	request.write(strData);
	request.end();
}else{
	if(DEBUG_VALUE)
		console.log("Incomplete Data");
}
}

Add Message Type and Device parameters

Add in your parameters from your newly added Message Type and Device

var hostIoT = 'iotmmsXXXXXXXXXXtrial.hanatrial.ondemand.com';
var authStrIoT = 'Bearer XXXXXXXXXXXX';
var deviceId = 'XXXXXX-XXXX-XXXX-XXXX-XXXXXXXXX';
var messageTypeID = 'XXXXXXXXXXXX';

Save and execute

node readTags.js