App add

app/.buckconfig

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+
+[android]
+  target = Google Inc.:Google APIs:23
+
+[maven_repositories]
+  central = https://repo1.maven.org/maven2

app/.eslintrc.js

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+module.exports = {
+  root: true,
+  extends: '@react-native-community',
+};

app/.flowconfig

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+[ignore]
+; We fork some components by platform
+.*/*[.]android.js
+
+; Ignore "BUCK" generated dirs
+<PROJECT_ROOT>/\.buckd/
+
+; Ignore polyfills
+node_modules/react-native/Libraries/polyfills/.*
+
+; These should not be required directly
+; require from fbjs/lib instead: require('fbjs/lib/warning')
+node_modules/warning/.*
+
+; Flow doesn't support platforms
+.*/Libraries/Utilities/LoadingView.js
+
+[untyped]
+.*/node_modules/@react-native-community/cli/.*/.*
+
+[include]
+
+[libs]
+node_modules/react-native/interface.js
+node_modules/react-native/flow/
+
+[options]
+emoji=true
+
+esproposal.optional_chaining=enable
+esproposal.nullish_coalescing=enable
+
+module.file_ext=.js
+module.file_ext=.json
+module.file_ext=.ios.js
+
+munge_underscores=true
+
+module.name_mapper='^react-native/\(.*\)$' -> '<PROJECT_ROOT>/node_modules/react-native/\1'
+module.name_mapper='^@?[./a-zA-Z0-9$_-]+\.\(bmp\|gif\|jpg\|jpeg\|png\|psd\|svg\|webp\|m4v\|mov\|mp4\|mpeg\|mpg\|webm\|aac\|aiff\|caf\|m4a\|mp3\|wav\|html\|pdf\)$' -> '<PROJECT_ROOT>/node_modules/react-native/Libraries/Image/RelativeImageStub'
+
+suppress_type=$FlowIssue
+suppress_type=$FlowFixMe
+suppress_type=$FlowFixMeProps
+suppress_type=$FlowFixMeState
+
+suppress_comment=\\(.\\|\n\\)*\\$FlowFixMe\\($\\|[^(]\\|(\\(<VERSION>\\)? *\\(site=[a-z,_]*react_native\\(_ios\\)?_\\(oss\\|fb\\)[a-z,_]*\\)?)\\)
+suppress_comment=\\(.\\|\n\\)*\\$FlowIssue\\((\\(<VERSION>\\)? *\\(site=[a-z,_]*react_native\\(_ios\\)?_\\(oss\\|fb\\)[a-z,_]*\\)?)\\)?:? #[0-9]+
+suppress_comment=\\(.\\|\n\\)*\\$FlowExpectedError
+
+[lints]
+sketchy-null-number=warn
+sketchy-null-mixed=warn
+sketchy-number=warn
+untyped-type-import=warn
+nonstrict-import=warn
+deprecated-type=warn
+unsafe-getters-setters=warn
+unnecessary-invariant=warn
+signature-verification-failure=warn
+deprecated-utility=error
+
+[strict]
+deprecated-type
+nonstrict-import
+sketchy-null
+unclear-type
+unsafe-getters-setters
+untyped-import
+untyped-type-import
+
+[version]
+^0.122.0

app/.gitattributes

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+*.pbxproj -text

app/.gitignore

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+# OSX
+#
+.DS_Store
+
+# Xcode
+#
+build/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
+*.xccheckout
+*.moved-aside
+DerivedData
+*.hmap
+*.ipa
+*.xcuserstate
+
+# Android/IntelliJ
+#
+build/
+.idea
+.gradle
+local.properties
+*.iml
+
+# node.js
+#
+node_modules/
+npm-debug.log
+yarn-error.log
+
+# BUCK
+buck-out/
+\.buckd/
+*.keystore
+!debug.keystore
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/
+
+*/fastlane/report.xml
+*/fastlane/Preview.html
+*/fastlane/screenshots
+
+# Bundle artifact
+*.jsbundle
+
+# CocoaPods
+/ios/Pods/

app/.prettierrc.js

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+module.exports = {
+  bracketSpacing: false,
+  jsxBracketSameLine: true,
+  singleQuote: true,
+  trailingComma: 'all',
+};

app/.watchmanconfig

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+{}

app/App.js

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+import * as React from 'react';
+import { useState } from 'react';
+import { NativeEventEmitter, NativeModules, Platform, PermissionsAndroid } from 'react-native';
+import { Text, View, Button } from 'react-native';
+import { NavigationContainer } from '@react-navigation/native';
+import { createBottomTabNavigator } from '@react-navigation/bottom-tabs';
+import MapView from "react-native-maps";
+// import BleManager from 'react-native-ble-manager';
+import BluetoothSerial from 'react-native-bluetooth-serial'
+
+
+function HomeScreen() {
+    const [isconnected, setIsConnected] = useState(false);   //state variable to hold boolean value of whether any device is connected
+    const [weight,setWeight] = useState("5 kg");
+    const peripherals = new Map();
+    const [list, setList] = useState([]);             //state variable to hold all discovered peripherals(not connected)
+    const [device, setDevice] = useState(null);       // state variable to hold current connected peripheral
+    const [readdata, setreaddata] = useState("");     //state variable to hold current read message
+
+
+    //Component to discover all unpaired devices within range
+    const discoverUnpaired = () => {
+        BluetoothSerial.discoverUnpairedDevices()
+          .then((unpairedDevices) => {
+            setList(unpairedDevices);
+          })
+          .catch(err => {console.error(err);
+            });
+        for(var i = 0; i < list.length; ++i)
+        {
+            console.log(list[i]);
+        }
+    }
+
+    discoverPaired_Connect = () => {
+        discoverPaired();
+        BluetoothConnect();
+    }
+
+    //Component to discover paired device (HC05) with phone
+    const discoverPaired = () => {
+        BluetoothSerial.list().then((pairedDevices) => {    
+            setDevice(pairedDevices[0]);
+            //console.log(device);
+        }).catch(err => {console.error(err);
+            });
+    }
+
+    //Component to connect to the HC05
+    const BluetoothConnect = () => {
+        BluetoothSerial.connect(device.id).then((res) => {
+            console.log("Connected to device:",device.name);
+            setIsConnected(true);
+          }).catch(err => {console.error(err);});
+        // setDevice(device);
+        //BluetoothSerial.pairDevice(device);
+    }
+
+    //Component to disconnect from bluetooth device
+    const BluetoothDisconnect = () => {
+        BluetoothSerial.disconnect()
+        .catch(err => {console.error(err);});
+        setIsConnected(false);
+        console.log("Disconnected from backpack")
+    }
+
+    const checkconnection = () => {
+        BluetoothSerial.isConnected().then((res) =>
+        {
+            console.log(res)
+        }).catch(err => {console.error(err);});
+    }
+
+    const GetWeight = () => {
+        setWeight("500 kg");
+    }
+
+   const WriteMessage = (message) => {
+     if (!isconnected) {
+       console.log('You must connect to device first');
+     }
+
+     BluetoothSerial.write(message)
+     .then((res) => {
+       console.log('Successfuly wrote to device');
+       //this.setState({ connected: true })
+     })
+     .catch(err => {console.error(err);});
+   }
+
+    React.useEffect(() => {
+        // this is a constructor (runs once)
+        if (Platform.OS === 'android' && Platform.Version >= 23) {
+            PermissionsAndroid.check(PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION).then((result) => {
+                if (result) {
+                  console.log("Permission is OK");
+                } else {
+                  PermissionsAndroid.request(PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION).then((result) => {
+                    if (result) {
+                      console.log("User accept");
+                    } else {
+                      console.log("User refuse");
+                    }
+                  });
+                }
+            });
+          }
+
+          discoverPaired();       //automatically as app opens up, the app tries to connect to the backpack.
+
+          BluetoothSerial.withDelimiter('\r\n').then((res) => {
+              console.log("Delimiter has been set up ");
+              BluetoothSerial.on('read', data => {
+                setreaddata(data);
+                //console.log(`DATA FROM BLUETOOTH: ${data.data}`);
+                // console.log(data.data);
+             });
+          })
+    }, [])
+
+    return (
+        <View style={{  flex: 1,
+                        justifyContent: 'center',
+                        alignItems: 'center'}}>
+
+            <View style={{margin: 10}}>
+                <Button title="Discover Paired devices" onPress={() => discoverPaired() } />
+            </View>
+
+            <View style={{margin: 10}}>
+                <Button title="Connect to backpack" onPress={() => BluetoothConnect() } />
+            </View>
+
+            <View style={{margin: 10}}>
+                <Button title="Disconnect from backpack" onPress={() => BluetoothDisconnect() } />
+            </View>
+
+            <View style={{margin: 10}}>
+                <Button title="Check if connected" onPress={() => checkconnection() } />
+            </View>
+
+            <View style={{margin: 10}}>
+                <Button title="Send request to backpack" onPress={() => WriteMessage(String("Hello\r\n")) } />
+            </View>
+
+            <View style={{margin: 10}}>
+                <Button title="Get Backpack Weight" onPress={() => GetWeight() } />
+            </View>
+
+            <Text> {readdata.data} </Text>
+            <Text> {weight} </Text>
+        </View>
+    );
+
+
+}
+
+function GPSScreen() {
+    const [region, setRegion] = useState({
+        latitude: 51.5079145,
+        longitude: -0.0899163,
+        latitudeDelta: 0.01,
+        longitudeDelta: 0.01 
+    });
+
+    return (
+        <MapView 
+            style={{  flex: 1  }} 
+            region={region}
+            onRegionChangeComplete={region => setRegion(region)}
+            showsUserLocation={true}
+            followsUserLocation={true}
+        />
+    );
+}
+
+function SettingScreen() {
+    return (
+        <View style={{flex: 1}}>
+        </View>
+    );
+}
+
+const Tab = createBottomTabNavigator();
+
+function MyTabs() {
+    return (
+    <Tab.Navigator>
+        <Tab.Screen name='Home' component={HomeScreen} />
+        <Tab.Screen name='GPS' component={GPSScreen} />
+        <Tab.Screen name="Settings" component={SettingScreen} />
+    </Tab.Navigator>
+    );
+}
+
+export default function App() {
+    return (
+    <NavigationContainer>
+        <MyTabs />
+    </NavigationContainer>
+    );
+}

app/__tests__/App-test.js

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+/**
+ * @format
+ */
+
+import 'react-native';
+import React from 'react';
+import App from '../App';
+
+// Note: test renderer must be required after react-native.
+import renderer from 'react-test-renderer';
+
+it('renders correctly', () => {
+  renderer.create(<App />);
+});