simulator v1

cmd/simulator/main.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"math/rand"
+	"time"
+
+	"ble_simulator/internal/ble"
+	"ble_simulator/internal/device"
+
+	"tinygo.org/x/bluetooth"
+)
+
+func main() {
+	log.Println("[INFO] BLE Simulator v1.0")
+
+	adapter := bluetooth.DefaultAdapter
+	must("enable BLE", adapter.Enable())
+
+	// Connection handler
+	adapter.SetConnectHandler(func(dev bluetooth.Device, connected bool) {
+		if connected {
+			log.Printf("[CONN] Client Connected: %s", dev.Address.String())
+		} else {
+			log.Println("[CONN] Client Disconnected")
+		}
+	})
+
+	// Setup device state and service
+	state := device.NewDeviceState()
+	notifyChar, err := ble.SetupService(adapter, state)
+	must("add service", err)
+
+	// Configure advertising
+	adv := adapter.DefaultAdvertisement()
+	must("configure adv", adv.Configure(bluetooth.AdvertisementOptions{
+		LocalName:    "GO_SIMULATOR",
+		ServiceUUIDs: []bluetooth.UUID{ble.ServiceUUID},
+	}))
+
+	must("start advertising", adv.Start())
+
+	log.Println("[INFO] Advertising as GO_SIMULATOR...")
+	log.Println("[INFO] Using Nordic UART Service (NUS) UUIDs")
+	log.Println("[INFO] Service UUID: 6e400001-b5a3-f393-e0a9-e50e24dcca9e")
+	log.Println("[INFO] Command Char: 6e400002-b5a3-f393-e0a9-e50e24dcca9e (Write/RX)")
+	log.Println("[INFO] Notify Char:  6e400003-b5a3-f393-e0a9-e50e24dcca9e (Notify/TX)")
+	log.Println("[INFO] Waiting for connections...")
+
+	// Start notification loop (500ms heartbeat with sensor data)
+	go notificationLoop(notifyChar, state)
+
+	// Block forever
+	select {}
+}
+
+func notificationLoop(char *bluetooth.Characteristic, state *device.DeviceState) {
+	ticker := time.NewTicker(500 * time.Millisecond)
+	for range ticker.C {
+		value := state.GetSensorValue()
+		// Add small jitter for realism (-10 to +10)
+		jitter := rand.Intn(21) - 10
+		msg := fmt.Sprintf("SENSOR:%d", value+jitter)
+
+		_, err := char.Write([]byte(msg + "\n"))
+		if err != nil {
+			// Silently ignore write errors (no subscribers)
+			continue
+		}
+		log.Printf("[TX] Sending: %s", msg)
+	}
+}
+
+func must(action string, err error) {
+	if err != nil {
+		log.Fatalf("Failed to %s: %v", action, err)
+	}
+}