Fix delivery acks and read receipts (#186)

* delivery ack and read receipt

* handle deliveryack

* fix uppercase id

* fix read receipts too

app/src/main/java/com/bitchat/android/mesh/BluetoothMeshService.kt

@@ -66,7 +66,7 @@ class BluetoothMeshService(private val context: Context) {
         // Wire up PacketProcessor reference for recursive handling in MessageHandler
         messageHandler.packetProcessor = packetProcessor
         sendPeriodicBroadcastAnnounce()
-        startPeriodicDebugLogging()
+        // startPeriodicDebugLogging()
     }
     
     /**
@@ -89,13 +89,13 @@ class BluetoothMeshService(private val context: Context) {
     }
 
     /**
-     * Send broadcast announcement every 10 seconds
+     * Send broadcast announcement every 30 seconds
      */
     private fun sendPeriodicBroadcastAnnounce() {
         serviceScope.launch {
             while (isActive) {
                 try {
-                    delay(10000) // 10 seconds
+                    delay(30000) // 30 seconds
                     sendBroadcastAnnounce()
                 } catch (e: Exception) {
                     Log.e(TAG, "Error in periodic broadcast announce: ${e.message}")
@@ -356,9 +356,9 @@ class BluetoothMeshService(private val context: Context) {
                 return fragmentManager.handleFragment(packet)
             }
             
-            override fun handleDeliveryAck(routed: RoutedPacket) {
+//            override fun handleDeliveryAck(routed: RoutedPacket) {
-                serviceScope.launch { messageHandler.handleDeliveryAck(routed) }
+//                serviceScope.launch { messageHandler.handleDeliveryAck(routed) }
-            }
+//            }
             
             override fun handleReadReceipt(routed: RoutedPacket) {
                 serviceScope.launch { messageHandler.handleReadReceipt(routed) }
@@ -552,7 +552,7 @@ class BluetoothMeshService(private val context: Context) {
             originalMessageID = message.id,
             recipientID = myPeerID,
             recipientNickname = nickname,
-            hopCount = 0u // Will be calculated during relay
+            hopCount = 0u.toUByte() // Will be calculated during relay
         )
         
         try {
@@ -586,6 +586,47 @@ class BluetoothMeshService(private val context: Context) {
         }
     }
     
+    /**
+     * Send read receipt for a received private message
+     */
+    fun sendReadReceipt(messageID: String, recipientPeerID: String, readerNickname: String) {
+        serviceScope.launch {
+            try {
+                Log.d(TAG, "Sending read receipt for message $messageID to $recipientPeerID")
+                
+                // Create the read receipt
+                val receipt = ReadReceipt(
+                    originalMessageID = messageID,
+                    readerID = myPeerID,
+                    readerNickname = readerNickname
+                )
+                
+                // Encode the receipt
+                val receiptData = receipt.encode()
+                
+                // Create inner read receipt packet
+                val innerPacket = BitchatPacket(
+                    version = 1u,
+                    type = MessageType.READ_RECEIPT.value,
+                    senderID = hexStringToByteArray(myPeerID),
+                    recipientID = hexStringToByteArray(recipientPeerID),
+                    timestamp = System.currentTimeMillis().toULong(),
+                    payload = receiptData,
+                    signature = null,
+                    ttl = 3u
+                )
+                
+                // Encrypt the entire inner packet and send as NOISE_ENCRYPTED
+                encryptAndBroadcastNoisePacket(innerPacket, recipientPeerID)
+                
+                Log.d(TAG, "Sent read receipt for message $messageID to $recipientPeerID")
+                
+            } catch (e: Exception) {
+                Log.e(TAG, "Failed to send read receipt for message $messageID: ${e.message}")
+            }
+        }
+    }
+    
     /**
      * Encrypt a BitchatPacket and broadcast it as a NOISE_ENCRYPTED message
      * This is the correct protocol implementation - encrypt the entire packet, not just the payload
@@ -644,14 +685,6 @@ class BluetoothMeshService(private val context: Context) {
                 payload = nickname.toByteArray()
             )
             
-            // Send multiple times for reliability
-            delay(Random.nextLong(0, 500))
-            connectionManager.broadcastPacket(RoutedPacket(announcePacket))
-            
-            delay(500 + Random.nextLong(0, 500))
-            connectionManager.broadcastPacket(RoutedPacket(announcePacket))
-            
-            delay(1000 + Random.nextLong(0, 500))
             connectionManager.broadcastPacket(RoutedPacket(announcePacket))
         }
     }

app/src/main/java/com/bitchat/android/mesh/MessageHandler.kt

@@ -58,19 +58,12 @@ class MessageHandler(private val myPeerID: String) {
                 
                 // Check if this is a delivery ACK with the new format
                 if (typeMarker == MessageType.DELIVERY_ACK.value) {
-                    // Extract the ACK JSON data (skip the type marker)
+                    handleDeliveryAck(decryptedData)
-                    val ackData = decryptedData.sliceArray(1 until decryptedData.size)
+                    Log.d(TAG, "Processed delivery ACK from $peerID")
-                    
-                    // Decode the delivery ACK
-                    val ack = DeliveryAck.decode(ackData)
-                    if (ack != null) {
-                        delegate?.onDeliveryAckReceived(ack)
-                        Log.d(TAG, "Processed delivery ACK from $peerID")
-                        return
-                    }
                 }
                 
                 // Check for read receipt with type marker
+                // NOTE: THIS DOESN'T WORK WITH IOS, IT SENDS AN INNER PACKET INSTEAD
                 if (typeMarker == MessageType.READ_RECEIPT.value) {
                     val receiptData = decryptedData.sliceArray(1 until decryptedData.size)
                     val receipt = ReadReceipt.decode(receiptData)
@@ -268,7 +261,7 @@ class MessageHandler(private val myPeerID: String) {
                 delegate?.onMessageReceived(message)
                 
                 // Send delivery ACK
-                // delegate?.sendDeliveryAck(message, peerID)
+                delegate?.sendDeliveryAck(message, peerID)
             }
             
         } catch (e: Exception) {
@@ -302,23 +295,13 @@ class MessageHandler(private val myPeerID: String) {
     /**
      * Handle delivery acknowledgment
      */
-    suspend fun handleDeliveryAck(routed: RoutedPacket) {
+    suspend fun handleDeliveryAck(decryptedData: ByteArray) {
-        val packet = routed.packet
+        val ackData = decryptedData.sliceArray(1 until decryptedData.size)
-        val peerID = routed.peerID ?: "unknown"
+        val ack = DeliveryAck.decode(ackData)
-        if (packet.recipientID != null && String(packet.recipientID).replace("\u0000", "") == myPeerID) {
+        if (ack != null) {
-            try {
+            delegate?.onDeliveryAckReceived(ack)
-                val decryptedData = delegate?.decryptFromPeer(packet.payload, peerID)
-                if (decryptedData != null) {
-                    val ack = DeliveryAck.decode(decryptedData)
-                    if (ack != null) {
-                        delegate?.onDeliveryAckReceived(ack)
-                    }
-                }
-            } catch (e: Exception) {
-                Log.e(TAG, "Failed to decrypt delivery ACK: ${e.message}")
-            }
         }
-        // Delivery ACK relay is now handled by centralized PacketRelayManager
+        return
     }
     
     /**
@@ -327,20 +310,11 @@ class MessageHandler(private val myPeerID: String) {
     suspend fun handleReadReceipt(routed: RoutedPacket) {
         val packet = routed.packet
         val peerID = routed.peerID ?: "unknown"
-        if (packet.recipientID != null && String(packet.recipientID).replace("\u0000", "") == myPeerID) {
+        val receipt = ReadReceipt.decode(routed.packet.payload)
-            try {
+        if (receipt != null) {
-                val decryptedData = delegate?.decryptFromPeer(packet.payload, peerID)
+            delegate?.onReadReceiptReceived(receipt)
-                if (decryptedData != null) {
-                    val receipt = ReadReceipt.decode(decryptedData)
-                    if (receipt != null) {
-                        delegate?.onReadReceiptReceived(receipt)
-                    }
-                }
-            } catch (e: Exception) {
-                Log.e(TAG, "Failed to decrypt read receipt: ${e.message}")
-            }
         }
-        // Read receipt relay is now handled by centralized PacketRelayManager
+        return
     }
     
     /**

app/src/main/java/com/bitchat/android/mesh/PacketProcessor.kt

@@ -139,7 +139,7 @@ class PacketProcessor(private val myPeerID: String) {
                         MessageType.NOISE_HANDSHAKE_INIT -> handleNoiseHandshake(routed, 1)
                         MessageType.NOISE_HANDSHAKE_RESP -> handleNoiseHandshake(routed, 2)
                         MessageType.NOISE_ENCRYPTED -> handleNoiseEncrypted(routed)
-                        MessageType.DELIVERY_ACK -> handleDeliveryAck(routed)
+                        //MessageType.DELIVERY_ACK -> handleDeliveryAck(routed) // custom packet type...
                         MessageType.READ_RECEIPT -> handleReadReceipt(routed)
                         else -> {
                             validPacket = false
@@ -234,11 +234,11 @@ class PacketProcessor(private val myPeerID: String) {
     /**
      * Handle delivery acknowledgment
      */
-    private suspend fun handleDeliveryAck(routed: RoutedPacket) {
+//    private suspend fun handleDeliveryAck(routed: RoutedPacket) {
-        val peerID = routed.peerID ?: "unknown"
+//        val peerID = routed.peerID ?: "unknown"
-        Log.d(TAG, "Processing delivery ACK from ${formatPeerForLog(peerID)}")
+//        Log.d(TAG, "Processing delivery ACK from ${formatPeerForLog(peerID)}")
-        delegate?.handleDeliveryAck(routed)
+//        delegate?.handleDeliveryAck(routed)
-    }
+//    }
     
     /**
      * Handle read receipt
@@ -313,7 +313,7 @@ interface PacketProcessorDelegate {
     fun handleMessage(routed: RoutedPacket)
     fun handleLeave(routed: RoutedPacket)
     fun handleFragment(packet: BitchatPacket): BitchatPacket?
-    fun handleDeliveryAck(routed: RoutedPacket)
+//    fun handleDeliveryAck(routed: RoutedPacket)
     fun handleReadReceipt(routed: RoutedPacket)
     
     // Communication

app/src/main/java/com/bitchat/android/model/BitchatMessage.kt

@@ -46,7 +46,7 @@ sealed class DeliveryStatus : Parcelable {
  */
 @Parcelize
 data class BitchatMessage(
-    val id: String = UUID.randomUUID().toString(),
+    val id: String = UUID.randomUUID().toString().uppercase(),
     val sender: String,
     val content: String,
     val timestamp: Date,

app/src/main/java/com/bitchat/android/model/DeliveryAck.kt

@@ -1,12 +1,13 @@
 package com.bitchat.android.model
 
 import android.os.Parcelable
-import com.google.gson.GsonBuilder
 import kotlinx.parcelize.Parcelize
+import com.bitchat.android.util.*
 import java.util.*
 
 /**
  * Delivery acknowledgment structure - exact same as iOS version
+ * Uses binary encoding for efficient protocol communication
  */
 @Parcelize
 data class DeliveryAck(
@@ -15,29 +16,91 @@ data class DeliveryAck(
     val recipientID: String,
     val recipientNickname: String,
     val timestamp: Date = Date(),
-    val hopCount: UInt
+    val hopCount: UByte
 ) : Parcelable {
 
-    private val gson = GsonBuilder()
+    // Primary constructor for creating new acks
-        .setDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'")
+    constructor(originalMessageID: String, recipientID: String, recipientNickname: String, hopCount: UByte) : this(
-        .create()
+        originalMessageID = originalMessageID,
-    
+        ackID = UUID.randomUUID().toString(),
-    fun encode(): ByteArray? {
+        recipientID = recipientID,
-        return try {
+        recipientNickname = recipientNickname,
-            gson.toJson(this).toByteArray(Charsets.UTF_8)
+        timestamp = Date(),
-        } catch (e: Exception) {
+        hopCount = hopCount
-            null
+    )
+
+    /**
+     * Encode to binary data matching iOS toBinaryData implementation
+     */
+    fun encode(): ByteArray {
+        val builder = BinaryDataBuilder()
+        
+        // Append original message UUID
+        builder.appendUUID(originalMessageID)
+        
+        // Append ack ID UUID
+        builder.appendUUID(ackID)
+        
+        // Append recipient ID as 8-byte hex string
+        val recipientData = ByteArray(8) { 0 }
+        var tempID = recipientID
+        var index = 0
+        
+        while (tempID.length >= 2 && index < 8) {
+            val hexByte = tempID.substring(0, 2)
+            val byte = hexByte.toIntOrNull(16)?.toByte()
+            if (byte != null) {
+                recipientData[index] = byte
+            }
+            tempID = tempID.substring(2)
+            index++
         }
+        
+        builder.buffer.addAll(recipientData.toList())
+        
+        // Append hop count (UInt8)
+        builder.appendUInt8(hopCount)
+        
+        // Append timestamp
+        builder.appendDate(timestamp)
+        
+        // Append recipient nickname as string
+        builder.appendString(recipientNickname)
+        
+        return builder.toByteArray()
     }
     
     companion object {
+        /**
+         * Decode from binary data matching iOS fromBinaryData implementation
+         */
         fun decode(data: ByteArray): DeliveryAck? {
-            return try {
+            // Create defensive copy
-                val json = String(data, Charsets.UTF_8)
+            val dataCopy = data.copyOf()
-                com.google.gson.Gson().fromJson(json, DeliveryAck::class.java)
+            
-            } catch (e: Exception) {
+            // Minimum size: 2 UUIDs (32) + recipientID (8) + hopCount (1) + timestamp (8) + min nickname
-                null
+            if (dataCopy.size < 50) return null
-            }
+            
+            val offset = intArrayOf(0)
+            
+            val originalMessageID = dataCopy.readUUID(offset) ?: return null
+            val ackID = dataCopy.readUUID(offset) ?: return null
+            
+            val recipientIDData = dataCopy.readFixedBytes(offset, 8) ?: return null
+            val recipientID = recipientIDData.hexEncodedString()
+            
+            val hopCount = dataCopy.readUInt8(offset) ?: return null
+            val timestamp = dataCopy.readDate(offset) ?: return null
+            val recipientNickname = dataCopy.readString(offset) ?: return null
+            
+            return DeliveryAck(
+                originalMessageID = originalMessageID,
+                ackID = ackID,
+                recipientID = recipientID,
+                recipientNickname = recipientNickname,
+                timestamp = timestamp,
+                hopCount = hopCount
+            )
         }
     }
 }

app/src/main/java/com/bitchat/android/model/ReadReceipt.kt

@@ -2,10 +2,12 @@ package com.bitchat.android.model
 
 import android.os.Parcelable
 import kotlinx.parcelize.Parcelize
+import com.bitchat.android.util.*
 import java.util.*
 
 /**
  * Read receipt structure - exact same as iOS version
+ * Uses binary encoding for efficient protocol communication
  */
 @Parcelize
 data class ReadReceipt(
@@ -15,23 +17,83 @@ data class ReadReceipt(
     val readerNickname: String,
     val timestamp: Date = Date()
 ) : Parcelable {
+
+    // Primary constructor for creating new read receipts
+    constructor(originalMessageID: String, readerID: String, readerNickname: String) : this(
+        originalMessageID = originalMessageID,
+        receiptID = UUID.randomUUID().toString(),
+        readerID = readerID,
+        readerNickname = readerNickname,
+        timestamp = Date()
+    )
     
-    fun encode(): ByteArray? {
+    /**
-        return try {
+     * Encode to binary data matching iOS toBinaryData implementation
-            com.google.gson.Gson().toJson(this).toByteArray(Charsets.UTF_8)
+     */
-        } catch (e: Exception) {
+    fun encode(): ByteArray {
-            null
+        val builder = BinaryDataBuilder()
+        
+        // Append original message UUID
+        builder.appendUUID(originalMessageID)
+        
+        // Append receipt ID UUID
+        builder.appendUUID(receiptID)
+        
+        // Append reader ID as 8-byte hex string
+        val readerData = ByteArray(8) { 0 }
+        var tempID = readerID
+        var index = 0
+        
+        while (tempID.length >= 2 && index < 8) {
+            val hexByte = tempID.substring(0, 2)
+            val byte = hexByte.toIntOrNull(16)?.toByte()
+            if (byte != null) {
+                readerData[index] = byte
+            }
+            tempID = tempID.substring(2)
+            index++
         }
+        
+        builder.buffer.addAll(readerData.toList())
+        
+        // Append timestamp
+        builder.appendDate(timestamp)
+        
+        // Append reader nickname as string
+        builder.appendString(readerNickname)
+        
+        return builder.toByteArray()
     }
     
     companion object {
+        /**
+         * Decode from binary data matching iOS fromBinaryData implementation
+         */
         fun decode(data: ByteArray): ReadReceipt? {
-            return try {
+            // Create defensive copy
-                val json = String(data, Charsets.UTF_8)
+            val dataCopy = data.copyOf()
-                com.google.gson.Gson().fromJson(json, ReadReceipt::class.java)
+            
-            } catch (e: Exception) {
+            // Minimum size: 2 UUIDs (32) + readerID (8) + timestamp (8) + min nickname
-                null
+            if (dataCopy.size < 49) return null
-            }
+            
+            val offset = intArrayOf(0)
+            
+            val originalMessageID = dataCopy.readUUID(offset) ?: return null
+            val receiptID = dataCopy.readUUID(offset) ?: return null
+            
+            val readerIDData = dataCopy.readFixedBytes(offset, 8) ?: return null
+            val readerID = readerIDData.hexEncodedString()
+            
+            val timestamp = dataCopy.readDate(offset) ?: return null
+            val readerNickname = dataCopy.readString(offset) ?: return null
+            
+            return ReadReceipt(
+                originalMessageID = originalMessageID,
+                receiptID = receiptID,
+                readerID = readerID,
+                readerNickname = readerNickname,
+                timestamp = timestamp
+            )
         }
     }
 }

app/src/main/java/com/bitchat/android/protocol/BinaryProtocol.kt

@@ -4,7 +4,7 @@ import android.os.Parcelable
 import kotlinx.parcelize.Parcelize
 import java.nio.ByteBuffer
 import java.nio.ByteOrder
-import java.util.*
+import android.util.Log
 
 /**
  * Message types - exact same as iOS version with Noise Protocol support
@@ -262,6 +262,7 @@ object BinaryProtocol {
             return paddedData
             
         } catch (e: Exception) {
+            Log.e("BinaryProtocol", "Error encoding packet type ${packet.type}: ${e.message}")
             return null
         }
     }

app/src/main/java/com/bitchat/android/ui/PrivateChatManager.kt

@@ -23,6 +23,9 @@ class PrivateChatManager(
     // Use centralized fingerprint management - NO LOCAL STORAGE
     private val fingerprintManager = PeerFingerprintManager.getInstance()
     
+    // Track received private messages that need read receipts
+    private val unreadReceivedMessages = mutableMapOf<String, MutableList<BitchatMessage>>()
+    
     // MARK: - Private Chat Lifecycle
     
     fun startPrivateChat(peerID: String, meshService: Any): Boolean {
@@ -46,6 +49,9 @@ class PrivateChatManager(
         // Initialize chat if needed
         messageManager.initializePrivateChat(peerID)
         
+        // Send read receipts for all unread messages from this peer
+        sendReadReceiptsForPeer(peerID, meshService)
+        
         return true
     }
     
@@ -242,16 +248,56 @@ class PrivateChatManager(
     fun handleIncomingPrivateMessage(message: BitchatMessage) {
         message.senderPeerID?.let { senderPeerID ->
             if (!isPeerBlocked(senderPeerID)) {
+                // Add to private messages
                 messageManager.addPrivateMessage(senderPeerID, message)
+                
+                // Track as unread for read receipt purposes
+                val unreadList = unreadReceivedMessages.getOrPut(senderPeerID) { mutableListOf() }
+                unreadList.add(message)
+                
+                Log.d(TAG, "Added received message ${message.id} from $senderPeerID to unread list (${unreadList.size} unread)")
             }
         }
     }
     
+    /**
+     * Send read receipts for all unread messages from a specific peer
+     * Called when the user focuses on a private chat
+     */
+    fun sendReadReceiptsForPeer(peerID: String, meshService: Any) {
+        val unreadList = unreadReceivedMessages[peerID]
+        if (unreadList.isNullOrEmpty()) {
+            Log.d(TAG, "No unread messages to send read receipts for peer $peerID")
+            return
+        }
+        
+        Log.d(TAG, "Sending read receipts for ${unreadList.size} unread messages from $peerID")
+        
+        // Send read receipt for each unread message
+        unreadList.forEach { message ->
+            try {
+                val method = meshService::class.java.getDeclaredMethod("sendReadReceipt", String::class.java, String::class.java, String::class.java)
+                val myNickname = state.getNicknameValue() ?: "unknown"
+                method.invoke(meshService, message.id, peerID, myNickname)
+                Log.d(TAG, "Sent read receipt for message ${message.id} to $peerID")
+            } catch (e: Exception) {
+                Log.w(TAG, "Failed to send read receipt for message ${message.id}: ${e.message}")
+            }
+        }
+        
+        // Clear the unread list since we've sent read receipts
+        unreadReceivedMessages.remove(peerID)
+    }
+    
     fun cleanupDisconnectedPeer(peerID: String) {
         // End private chat if peer disconnected
         if (state.getSelectedPrivateChatPeerValue() == peerID) {
             endPrivateChat()
         }
+        
+        // Clean up unread messages for disconnected peer
+        unreadReceivedMessages.remove(peerID)
+        Log.d(TAG, "Cleaned up unread messages for disconnected peer $peerID")
     }
     
     // MARK: - Utility Functions
@@ -284,6 +330,9 @@ class PrivateChatManager(
         state.setSelectedPrivateChatPeer(null)
         state.setUnreadPrivateMessages(emptySet())
         
+        // Clear unread messages tracking
+        unreadReceivedMessages.clear()
+        
         // Clear fingerprints via centralized manager (only if needed for emergency clear)
         // Note: This will be handled by the parent PeerManager.clearAllPeers()
     }