feat: Buttons for LED on and off

Sources/scoobytag/BluetoothManager.swift

@@ -8,12 +8,39 @@ struct Constants {
 
 final class BluetoothManager: NSObject, ObservableObject {
     private var centralManager: CBCentralManager!
-    private var myPeripheral: CBPeripheral?
+    private var tagPerihp: CBPeripheral?
+    private var scbtSvc: CBService?
+    private var petChar: CBCharacteristic?
 	@Published var status = "Starting..."
 
     override init() {
         super.init()
-        periphManager = CBPeripheralManager(delegate: self, queue: nil)
+        centralManager = CBCentralManager(
+            delegate: self,
+            queue: nil,
+            //options: [
+            //    CBCentralManagerOptionRestoreIdentifierKey: "DogCollarCentral"
+            //]
+        )
+    }
+
+    func led_on() {
+        pet_write(0)
+    }
+
+    func led_off() {
+        pet_write(1)
+    }
+
+    func pet_write(_ value: UInt32) {
+        if tagPerihp == nil || petChar == nil {
+            status = "Not connected!"
+            return
+        }
+
+        var lvalue = value
+        let data = Data(bytes: &lvalue, count: MemoryLayout<UInt32>.size)
+        tagPerihp!.writeValue(data, for: petChar!, type: .withResponse)
     }
 }
 
@@ -40,13 +67,9 @@ extension BluetoothManager: CBCentralManagerDelegate, CBPeripheralDelegate {
         advertisementData: [String: Any],
         rssi RSSI: NSNumber
     ) {
-        if (peripheral.name != nil) {
-            status = "Found: \(peripheral.name!)"
-        } else {
-            status = "Found: \(peripheral.identifier)"
-        }
-
-        myPeripheral = peripheral
+        let name = peripheral.name ?? peripheral.identifier.uuidString
+        status = "Found \(name)"
+        tagPerihp = peripheral
         central.stopScan()
         central.connect(peripheral)
     }
@@ -56,7 +79,8 @@ extension BluetoothManager: CBCentralManagerDelegate, CBPeripheralDelegate {
         _ central: CBCentralManager,
         didConnect peripheral: CBPeripheral
     ) {
-        status = "Connected"
+        let name = peripheral.name ?? peripheral.identifier.uuidString
+        status = "Connected to \(name)"
         let uuid = CBUUID(string: Constants.scbtSvcUuid)
         peripheral.discoverServices([uuid])
         peripheral.delegate = self
@@ -72,6 +96,9 @@ extension BluetoothManager: CBCentralManagerDelegate, CBPeripheralDelegate {
         if (error == nil) { error2 = "unknown" }
         else { error2 = "\(error!)" }
         status = "Failed: \(error2)"
+
+        tagPerihp = nil
+        petChar = nil
     }
 
     // Disconnection callback
@@ -84,6 +111,9 @@ extension BluetoothManager: CBCentralManagerDelegate, CBPeripheralDelegate {
         if (error == nil) { error2 = "unknown" }
         else { error2 = "\(error!)" }
         status = "Disconnected: \(error2)"
+
+        tagPerihp = nil
+        petChar = nil
     }
 
     // Service callback
@@ -93,16 +123,18 @@ extension BluetoothManager: CBCentralManagerDelegate, CBPeripheralDelegate {
     ) {
         guard let services = peripheral.services else { return }
 
-        status = "Service found"
-
-        let scbtSvc = CBUUID(string: Constants.scbtSvcUuid)
-        let scbtPet = CBUUID(string: Constants.scbtPetUuid)
+        let svcUUID = CBUUID(string: Constants.scbtSvcUuid)
+        let petUUID = CBUUID(string: Constants.scbtPetUuid)
 
         for service in services {
-            // Ignore non scbtSvc
-            if (service.uuid != scbtSvc) { continue }
+            if (service.uuid == svcUUID) {
+                scbtSvc = service
+                peripheral.discoverCharacteristics([petUUID], for: service)
+            }
+        }
 
-            peripheral.discoverCharacteristics([scbtPet], for: service)
+        if scbtSvc == nil {
+            status = "Could not find scbt service"
         }
     }
 
@@ -118,20 +150,17 @@ extension BluetoothManager: CBCentralManagerDelegate, CBPeripheralDelegate {
         }
 
         guard let characteristics = service.characteristics else { return }
-
-        status = "Characteristics found (\(characteristics.count))"
-
         let scbtPet = CBUUID(string: Constants.scbtPetUuid)
 
-        for characteristic in characteristics {
-            // Ignore non pet
-            if (characteristic.uuid != scbtPet) { continue }
+        for characteristic: CBCharacteristic in characteristics {
+            if (characteristic.uuid == scbtPet) {
+                petChar = characteristic
+                status = "Found pet characteristic"
+            }
+        }
 
-            var value: UInt32 = 0
-            let data = Data(bytes: &value, count: MemoryLayout<UInt32>.size)
-
-            perihperal.writeValue(data, for: characteristic, type: .withResponse)
-            status = "Written \(data)"
+        if petChar == nil {
+            status = "Could not find pet characteristic"
         }
     }
 

Sources/scoobytag/ContentView.swift

@@ -5,12 +5,15 @@ struct ContentView: View {
 
     var body: some View {
         VStack {
-            Image(systemName: "globe")
-                .imageScale(.large)
-                .foregroundStyle(.tint)
-            Text("Hello, world!")
             Text(bluetoothManager.status)
+            Button(action: bluetoothManager.led_on) {
+                Text("LED On")
+            }
+            Button(action: bluetoothManager.led_off) {
+                Text("LED Off")
+            }
         }
         .padding()
+        .buttonStyle(BorderedButtonStyle())
     }
 }