feat: subscribe to demo char changes
This commit is contained in:
Fabian Christoffel
@@ -13,14 +13,14 @@
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.punchthrough.blestarterappandroid.ble
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package com.example.sensortestingapp
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import android.annotation.SuppressLint
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import android.bluetooth.BluetoothDevice
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import android.bluetooth.BluetoothGatt
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import android.bluetooth.BluetoothGattCallback
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import android.bluetooth.BluetoothGattCharacteristic
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import android.bluetooth.BluetoothGattDescriptor
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import android.bluetooth.BluetoothProfile
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import android.content.Context
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import android.util.Log
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@@ -28,6 +28,8 @@ import java.util.UUID
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import java.util.concurrent.ConcurrentHashMap
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import java.util.concurrent.ConcurrentLinkedQueue
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val CCC_DESCRIPTOR_UUID = UUID.fromString("00002902-0000-1000-8000-00805F9B34FB")
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private const val GATT_MIN_MTU_SIZE = 23
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/** Maximum BLE MTU size as defined in gatt_api.h. */
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@@ -59,6 +61,14 @@ data class ReadChar(
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val charId: UUID
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) : BleOperationType()
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data class SetNotification(
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override val device: BluetoothDevice,
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val serviceId: UUID,
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val charId: UUID,
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val enable: Boolean
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) : BleOperationType()
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data class DiscoverServicesRequest(
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override val device: BluetoothDevice,
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) : BleOperationType()
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@@ -70,6 +80,12 @@ open class BleListener {
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characteristic: BluetoothGattCharacteristic
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) {
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}
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open fun onCharChange(
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gatt: BluetoothGatt,
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characteristic: BluetoothGattCharacteristic
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) {
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}
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}
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@@ -173,6 +189,15 @@ object ConnectionManager {
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enqueueOperation(ReadChar(device, service, char))
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}
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fun enableNotification(device: BluetoothDevice, service: UUID, char: UUID) {
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enqueueOperation(SetNotification(device, service, char, true))
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}
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fun disableNotification(device: BluetoothDevice, service: UUID, char: UUID) {
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enqueueOperation(SetNotification(device, service, char, false))
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}
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// - Beginning of PRIVATE functions
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@Synchronized
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@@ -235,6 +260,7 @@ object ConnectionManager {
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return
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}
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when (operation) {
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is Disconnect -> with(operation) {
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Log.w("ConnectionManager", "Disconnecting from ${device.address}")
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@@ -256,12 +282,67 @@ object ConnectionManager {
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if (characteristic?.isReadable() == true) {
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gatt.readCharacteristic(characteristic)
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} else {
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Log.e("ConnectionManager", "Char $charId (${serviceId}) is not readable!")
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signalEndOfOperation()
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}
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}
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is SetNotification -> with(operation) {
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val characteristic = gatt.getService(serviceId)?.getCharacteristic(charId);
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if (characteristic == null) {
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Log.e("ConnectionManager", "Char $charId (${serviceId}) not found!")
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signalEndOfOperation()
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return
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}
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val descriptor = characteristic.getDescriptor(CCC_DESCRIPTOR_UUID)
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if (!characteristic.isNotifiable() && !characteristic.isIndicatable()) {
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Log.e(
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"ConnectionManager", "Char ${characteristic.uuid} (service: $serviceId)" +
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" doesn't support notifications/indications"
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)
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signalEndOfOperation()
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return
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}
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val payload: ByteArray
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if (enable) {
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if (!gatt.setCharacteristicNotification(characteristic, true)) {
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Log.e(
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"ConnectionManager", "setCharacteristicNotification to true " +
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"failed for ${characteristic.uuid} (service: $serviceId)"
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)
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signalEndOfOperation()
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return
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}
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payload =
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if (characteristic.isIndicatable())
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BluetoothGattDescriptor.ENABLE_INDICATION_VALUE
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else BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE;
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} else {
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if (!gatt.setCharacteristicNotification(characteristic, false)) {
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Log.e(
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"ConnectionManager", "setCharacteristicNotification to false " +
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"failed for ${characteristic.uuid} (service: $serviceId)"
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)
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signalEndOfOperation()
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return
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}
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payload = BluetoothGattDescriptor.DISABLE_NOTIFICATION_VALUE
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}
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gatt.let { gatt ->
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descriptor.value = payload
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gatt.writeDescriptor(descriptor)
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}
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}
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// necessary because of IDE type inference bug
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// https://youtrack.jetbrains.com/issue/KTIJ-20749/Exhaustive-when-check-does-not-take-into-account-the-values-excluded-by-previous-if-conditions
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is Connect -> {
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Log.e("ConnectionManager", "Shouldn't get here")
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}
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@@ -365,11 +446,33 @@ object ConnectionManager {
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}
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}
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if (pendingOperation is ReadChar) {
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val op = pendingOperation
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if (op is ReadChar && op.charId == characteristic.uuid && op.serviceId == characteristic.service.uuid) {
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signalEndOfOperation()
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}
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}
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override fun onDescriptorWrite(
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gatt: BluetoothGatt,
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descriptor: BluetoothGattDescriptor,
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status: Int
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) {
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val op = pendingOperation
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if (op is SetNotification &&
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descriptor.uuid == CCC_DESCRIPTOR_UUID
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&& op.charId == descriptor.characteristic.uuid && op.serviceId == descriptor.characteristic.service.uuid
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) {
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signalEndOfOperation()
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}
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}
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override fun onCharacteristicChanged(
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gatt: BluetoothGatt,
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characteristic: BluetoothGattCharacteristic
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) {
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notifyListeners { listener -> listener.onCharChange(gatt, characteristic) }
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}
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}
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@@ -28,8 +28,6 @@ import androidx.recyclerview.widget.LinearLayoutManager
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import androidx.recyclerview.widget.RecyclerView
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import androidx.recyclerview.widget.SimpleItemAnimator
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import com.example.sensortestingapp.databinding.ActivityMainBinding
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import com.punchthrough.blestarterappandroid.ble.BleListener
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import com.punchthrough.blestarterappandroid.ble.ConnectionManager
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import java.nio.ByteBuffer
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import java.nio.ByteOrder
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import java.util.UUID
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@@ -138,21 +136,36 @@ class MainActivity : AppCompatActivity() {
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ConnectionManager.connect(scanResult.device, applicationContext)
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ConnectionManager.requestMtu(scanResult.device, Int.MAX_VALUE)
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ConnectionManager.discoverServices(scanResult.device)
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ConnectionManager.readChar(scanResult.device, DEMO_SERVICE_UUID, DEMO_CHAR_UUID)
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//ConnectionManager.readChar(scanResult.device, DEMO_SERVICE_UUID, DEMO_CHAR_UUID)
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ConnectionManager.enableNotification(
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scanResult.device,
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DEMO_SERVICE_UUID,
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DEMO_CHAR_UUID
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)
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}
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}
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private val bleListener = object : BleListener() {
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fun logDemoPayload(characteristic: BluetoothGattCharacteristic) {
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if (characteristic.service.uuid == DEMO_SERVICE_UUID && characteristic.uuid == DEMO_CHAR_UUID) {
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val payload = decodeDemoPayload(characteristic.value)
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Log.i("BleListener", "Demo char received: $payload")
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}
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}
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override fun onSuccessfulCharRead(
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gatt: BluetoothGatt,
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characteristic: BluetoothGattCharacteristic
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) {
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if (characteristic.service.uuid == DEMO_SERVICE_UUID && characteristic.uuid == DEMO_CHAR_UUID) {
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val payload = decodeDemoPayload(characteristic.value)
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Log.i("BleListener", "Demo char received: $payload")
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logDemoPayload(characteristic)
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}
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override fun onCharChange(
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gatt: BluetoothGatt,
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characteristic: BluetoothGattCharacteristic
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) {
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logDemoPayload(characteristic)
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}
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}
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