2 files changed, 293 insertions, 0 deletions

diff --git a/src/App.tsx b/src/App.tsx
new file mode 100644
index 0000000..7972da9
--- /dev/null
+++ b/src/App.tsx
@@ -0,0 +1,107 @@
+import React, {useEffect, useState} from 'react';
+import type {PropsWithChildren} from 'react';
+import {
+  Button,
+  FlatList,
+  SafeAreaView,
+  ScrollView,
+  StatusBar,
+  StyleSheet,
+  Text,
+  useColorScheme,
+  View,
+} from 'react-native';
+
+import Toast from 'react-native-toast-message';
+import BleService, {Peripheral} from './ble-service';
+
+const bleService = new BleService();
+
+function App(): React.JSX.Element {
+  bleService: BleService;
+
+  const [isScanning, setIsScanning] = useState<boolean>(false);
+  const [peripherals, setPeripherals] = useState<
+    Map<Peripheral['id'], Peripheral>
+  >([]);
+
+  useEffect(() => {
+    bleService.setEvents({
+      bleManagerConnectPeripheral: e => console.log(e.peripheral),
+      bleManagerStartSuccess: () => {
+        Toast.show({
+          type: 'info',
+          text1: 'BleManager started..',
+        });
+      },
+      bleManagerDiscoverPeripheral: p => {
+        console.log(p.advertising.localName);
+      },
+      bleManagerStopScan: () => {
+        setIsScanning(false);
+        setPeripherals(bleService.getPeripherals());
+
+        console.log('scan: stop;');
+        Toast.show({
+          type: 'success',
+          text1: 'Scan stop..',
+          position: 'bottom',
+        });
+      },
+      bleManagerStartScan: () => {
+        setIsScanning(true);
+        console.log('scan: start;');
+        Toast.show({
+          type: 'info',
+          text1: 'Scan start..',
+          position: 'bottom',
+        });
+      },
+      bleManagerDidUpdateValueForCharacteristic: a => {
+        console.log(a.value);
+      },
+    });
+
+    return () => bleService.destroy();
+  });
+
+  return (
+    <>
+      <Toast />
+      <View>
+        <Text>Hello, World!!!!</Text>
+        {isScanning ? <Text>SKANUJE!</Text> : <Text>Juz nie</Text>}
+        <Button
+          onPress={() => {
+            bleService.scan();
+          }}
+          title="Scan!"
+        />
+        <FlatList
+          data={[...peripherals.values()]}
+          renderItem={({item}) => (
+            <>
+              <Text>id: {item.id}</Text>
+              <Text>name: {item.name}</Text>
+              <Button
+                onPress={() => {
+                  bleService.connect(item);
+                }}
+                title="Connect!"
+              />
+              <Button
+                onPress={() => {
+                  console.log(bleService.read(item));
+                }}
+                title="Read!"
+              />
+              <Text>-------</Text>
+            </>
+          )}
+        />
+      </View>
+    </>
+  );
+}
+
+export default App;
diff --git a/src/ble-service.ts b/src/ble-service.ts
new file mode 100644
index 0000000..f2a08a3
--- /dev/null
+++ b/src/ble-service.ts
@@ -0,0 +1,186 @@
+import BleManager, {
+  BleConnectPeripheralEvent,
+  BleDisconnectPeripheralEvent,
+  BleManagerDidUpdateValueForCharacteristicEvent,
+  BleScanCallbackType,
+  BleScanMatchMode,
+  BleScanMode,
+  Peripheral as PeripheralWithoutConnectInfo,
+} from 'react-native-ble-manager';
+import {
+  EmitterSubscription,
+  NativeEventEmitter,
+  NativeModules,
+  PermissionsAndroid,
+  Platform,
+} from 'react-native';
+
+import Buffer from 'buffer';
+
+export type Peripheral = PeripheralWithoutConnectInfo & {
+  connected?: boolean;
+  connecting?: boolean;
+};
+
+type Events = {
+  bleManagerStartSuccess: () => void | undefined;
+  bleManagerStartError: () => void | undefined;
+  bleManagerStopScan: () => void | undefined;
+  bleManagerStartScan: () => void | undefined;
+  bleManagerDiscoverPeripheral: (peripheral: Peripheral) => void | undefined;
+  bleManagerDisconnectPeripheral: (
+    event: BleDisconnectPeripheralEvent,
+  ) => void | undefined;
+  bleManagerDidUpdateValueForCharacteristic: (
+    event: BleManagerDidUpdateValueForCharacteristicEvent,
+  ) => void | undefined;
+  bleManagerConnectPeripheral: (
+    event: BleConnectPeripheralEvent,
+  ) => void | undefined;
+};
+
+export default class BleService {
+  private _bleManagerModule = NativeModules.BleManager;
+  private _bleManagerEmitter = new NativeEventEmitter(this._bleManagerModule);
+  private _events: Events;
+  private _listeners: EmitterSubscription[];
+  private _peripherals: Map<Peripheral['id'], Peripheral>;
+
+  constructor() {
+    this._listeners = [];
+    this._events = {};
+    this._peripherals = new Map();
+    BleManager.start({showAlert: false})
+      .then(() => {
+        this.runEvent(this._events.bleManagerStartSuccess);
+        console.debug('[BleService]: BleManager started.');
+      })
+      .catch((err: any) => {
+        this.runEvent(this._events.bleManagerStartError);
+        console.debug('[BleService]: BeManager could not be started.', err);
+      });
+    this.handle_permissions();
+  }
+
+  setEvents(events: Events) {
+    this._events = events;
+    this.setupListiners(events);
+  }
+
+  handle_permissions() {
+    // po requestach, jak sie zrobi .then() nastepnie gdy (resoult) cos zwroci to oznacza, że ma perma jak nie to nie ma.
+    if (Platform.OS === 'android') {
+      if (Platform.Version >= 31)
+        PermissionsAndroid.requestMultiple([
+          PermissionsAndroid.PERMISSIONS.BLUETOOTH_SCAN,
+          PermissionsAndroid.PERMISSIONS.BLUETOOTH_CONNECT,
+        ]);
+      else if (Platform.Version >= 23)
+        PermissionsAndroid.request(
+          PermissionsAndroid.PERMISSIONS.ACCESS_FINE_LOCATION,
+        );
+    }
+  }
+
+  scan() {
+    this.runEvent(this._events.bleManagerStartScan);
+    this.clearPeripherals();
+    BleManager.scan([], 3, false, {
+      matchMode: BleScanMatchMode.Sticky,
+      scanMode: BleScanMode.LowLatency,
+      callbackType: BleScanCallbackType.AllMatches,
+    })
+      .then(() => {
+        console.debug('[startScan] scan promise returned successfully.');
+      })
+      .catch((err: any) => {
+        console.error('[startScan] ble scan returned in error', err);
+      });
+  }
+
+  destroy() {
+    this.destroyListiners();
+  }
+
+  getPeripherals() {
+    return this._peripherals;
+  }
+
+  connect(p: Peripheral) {
+    return BleManager.connect(p.id);
+  }
+
+  async read(peripheral: Peripheral) {
+    await BleManager.requestMTU(peripheral.id, 512);
+    BleManager.startNotification(
+      peripheral.id,
+      '6e400001-b5a3-f393-e0a9-e50e24dcca9e',
+      '6e400003-b5a3-f393-e0a9-e50e24dcca9e',
+    )
+      .then(a => {
+        // Success code
+        console.log('--------');
+        console.log(a);
+        console.log('--------');
+      })
+      .catch(error => {
+        // Failure code
+        console.log(error);
+      });
+  }
+
+  private addPeripheral(p: Peripheral) {
+    this._peripherals.set(p.id, p);
+  }
+
+  private clearPeripherals() {
+    this._peripherals = new Map();
+  }
+
+  private destroyListiners() {
+    for (const listener of this._listeners) {
+      if (listener) listener.remove();
+    }
+  }
+
+  private setupListiners(events: Events) {
+    this.destroyListiners();
+    this._listeners = [
+      this._bleManagerEmitter.addListener(
+        'BleManagerDiscoverPeripheral',
+        peripheral => {
+          this.addPeripheral(peripheral);
+          this.runEvent(events.bleManagerDiscoverPeripheral, peripheral);
+        },
+      ),
+      this._bleManagerEmitter.addListener('BleManagerStopScan', () =>
+        this.runEvent(events.bleManagerStopScan),
+      ),
+      this._bleManagerEmitter.addListener(
+        'BleManagerDisconnectPeripheral',
+        event => this.runEvent(events.bleManagerDisconnectPeripheral, event),
+      ),
+      this._bleManagerEmitter.addListener(
+        'BleManagerDidUpdateValueForCharacteristic',
+        event =>
+          this.runEvent(
+            events.bleManagerDidUpdateValueForCharacteristic,
+            event,
+          ),
+      ),
+      this._bleManagerEmitter.addListener(
+        'BleManagerConnectPeripheral',
+        event => this.runEvent(events.bleManagerConnectPeripheral, event),
+      ),
+    ];
+  }
+
+  private runEvent(
+    event: CallableFunction | undefined,
+    ...optionalParams: any[]
+  ): void {
+    if (event) {
+      event(...optionalParams);
+    }
+  }
+}