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Device: Send extended init packet to all AirPods models #517

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Merged
d4rken merged 1 commit into from
Apr 15, 2026
Merged

Device: Send extended init packet to all AirPods models #517

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7 changes: 0 additions & 7 deletions app/src/main/java/eu/darken/capod/pods/core/apple/PodModel.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -99,7 +99,6 @@ enum class PodModel(
hasAllowOffOption = true,
hasStemConfig = true,
hasSleepDetection = true,
needsInitExt = true,
),
modelNumbers = setOf("A3055", "A3056", "A3057"), // earphones
leftPodIconRes = R.drawable.device_airpods_gen4anc_left,
Expand Down Expand Up @@ -158,7 +157,6 @@ enum class PodModel(
hasAllowOffOption = true,
hasStemConfig = true,
hasSleepDetection = true,
needsInitExt = true,
),
modelNumbers = setOf("A2698", "A2699", "A2931"), // earphones
leftPodIconRes = R.drawable.device_airpods_pro2_left,
Expand Down Expand Up @@ -192,7 +190,6 @@ enum class PodModel(
hasAllowOffOption = true,
hasStemConfig = true,
hasSleepDetection = true,
needsInitExt = true,
),
modelNumbers = setOf("A3047", "A3048", "A3049"), // earphones
leftPodIconRes = R.drawable.device_airpods_pro2_left,
Expand Down Expand Up @@ -226,7 +223,6 @@ enum class PodModel(
hasAllowOffOption = true,
hasStemConfig = true,
hasSleepDetection = true,
needsInitExt = true,
),
modelNumbers = setOf("A3063", "A3064", "A3065"), // earphones
leftPodIconRes = R.drawable.device_airpods_pro2_left,
Expand Down Expand Up @@ -281,7 +277,6 @@ enum class PodModel(
hasEarDetectionToggle = true,
hasListeningModeCycle = true,
hasAllowOffOption = true,
needsInitExt = true,
),
modelNumbers = setOf("A3454"), // headphones
),
Expand Down Expand Up @@ -550,7 +545,5 @@ enum class PodModel(
val hasAllowOffOption: Boolean = false,
val hasStemConfig: Boolean = false,
val hasSleepDetection: Boolean = false,
// Protocol
val needsInitExt: Boolean = false,
)
}
10 changes: 4 additions & 6 deletions app/src/main/java/eu/darken/capod/pods/core/apple/aap/AapConnection.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -110,12 +110,10 @@ internal class AapConnection(
}
log(TAG) { "Notification enable sent" }

// Send InitExt for models that need it (Pro 2/3/USB-C, AP4 ANC)
profile.encodeInitExt()?.let { initExt ->
sock.outputStream.write(initExt)
sock.outputStream.flush()
log(TAG) { "InitExt sent" }
}
// Send InitExt — enables advanced features on H2+ devices, ignored by older models
sock.outputStream.write(profile.encodeInitExt())
sock.outputStream.flush()
log(TAG) { "InitExt sent" }

// Request private keys (IRK + ENC) for BLE encrypted battery
profile.encodePrivateKeyRequest()?.let { keyReq ->
Expand Down
7 changes: 4 additions & 3 deletions app/src/main/java/eu/darken/capod/pods/core/apple/aap/protocol/AapDeviceProfile.kt
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Expand Up @@ -50,10 +50,11 @@ interface AapDeviceProfile {
fun encodeNotificationEnable(): List<ByteArray>

/**
* Encode the extended init packet (0x4D) for models that require it
* (e.g., Pro 2/3/USB-C, AirPods 4 ANC). Returns null if not needed.
* Encode the extended init packet (0x4D).
* Enables advanced features (Adaptive Transparency, Conversational Awareness during playback)
* on H2+ devices; silently ignored by older models.
*/
fun encodeInitExt(): ByteArray?
fun encodeInitExt(): ByteArray

/**
* Encode a private key request (command 0x30).
Expand Down
11 changes: 4 additions & 7 deletions app/src/main/java/eu/darken/capod/pods/core/apple/aap/protocol/DefaultAapDeviceProfile.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -83,13 +83,10 @@ class DefaultAapDeviceProfile(
byteArrayOf(0x04, 0x00, 0x04, 0x00, 0x0f, 0x00, 0xff.toByte(), 0xff.toByte(), 0xff.toByte(), 0xff.toByte()),
)

override fun encodeInitExt(): ByteArray? {
if (!model.features.needsInitExt) return null
return byteArrayOf(
0x04, 0x00, 0x04, 0x00, 0x4d, 0x00, 0xd7.toByte(), 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
)
}
override fun encodeInitExt(): ByteArray = byteArrayOf(
0x04, 0x00, 0x04, 0x00, 0x4d, 0x00, 0xd7.toByte(), 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
)

override fun encodeCommand(command: AapCommand): ByteArray = when (command) {
is AapCommand.SetAncMode -> buildSettingsMessage(SETTING_ANC_MODE, encodeAncMode(command.mode))
Expand Down
1 change: 0 additions & 1 deletion ...ava/eu/darken/capod/pods/core/apple/aap/devices/DefaultAapDeviceProfileNewSettingsTest.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -349,7 +349,6 @@ class DefaultAapDeviceProfileNewSettingsTest : BaseAapSessionTest() {
f.hasListeningModeCycle shouldBe true
f.hasAllowOffOption shouldBe true
f.hasEarDetectionToggle shouldBe true
f.needsInitExt shouldBe true
// Headphone — no stem/swipe/dual-pod/case features
f.hasDualPods shouldBe false
f.hasCase shouldBe false
Expand Down
12 changes: 1 addition & 11 deletions app/src/test/java/eu/darken/capod/pods/core/apple/aap/devices/DefaultAapDeviceProfileTest.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -57,19 +57,9 @@ class DefaultAapDeviceProfileTest : BaseAapSessionTest() {

@Nested
inner class InitExtTests {
@Test
fun `returned for Pro 2`() { DefaultAapDeviceProfile(PodModel.AIRPODS_PRO2).encodeInitExt().shouldNotBeNull() }
@Test fun `returned for Pro 3`() { DefaultAapDeviceProfile(PodModel.AIRPODS_PRO3).encodeInitExt().shouldNotBeNull() }
@Test fun `returned for AP4 ANC`() { DefaultAapDeviceProfile(PodModel.AIRPODS_GEN4_ANC).encodeInitExt().shouldNotBeNull() }
@Test
fun `null for basic AirPods`() { DefaultAapDeviceProfile(PodModel.AIRPODS_GEN3).encodeInitExt().shouldBeNull() }
@Test fun `null for Pro 1`() { DefaultAapDeviceProfile(PodModel.AIRPODS_PRO).encodeInitExt().shouldBeNull() }
@Test fun `null for Max`() { DefaultAapDeviceProfile(PodModel.AIRPODS_MAX).encodeInitExt().shouldBeNull() }
@Test fun `returned for Max 2`() { DefaultAapDeviceProfile(PodModel.AIRPODS_MAX2).encodeInitExt().shouldNotBeNull() }

@Test
fun `has correct command byte`() {
profile.encodeInitExt()!![4] shouldBe 0x4d.toByte()
profile.encodeInitExt()[4] shouldBe 0x4d.toByte()
}
}

Expand Down