new files

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

@@ -0,0 +1,138 @@
+package com.bitchat.android.mesh
+
+import android.util.Log
+import com.bitchat.android.model.RoutedPacket
+import com.bitchat.android.protocol.BitchatPacket
+import com.bitchat.android.protocol.MessageType
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.CoroutineStart
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.isActive
+import kotlinx.coroutines.launch
+import java.security.MessageDigest
+import java.util.concurrent.ConcurrentHashMap
+
+/**
+ * Shared transport send wrapper that applies bitchat packet fragmentation and
+ * transfer progress before a transport writes packets to its concrete medium.
+ */
+class FragmentingPacketSender(
+    private val scope: CoroutineScope,
+    private val fragmentManager: FragmentManager?,
+    private val logTag: String,
+    private val interFragmentDelayMs: Long = 20L
+) {
+    private val transferJobs = ConcurrentHashMap<String, Job>()
+
+    fun send(
+        routed: RoutedPacket,
+        description: String,
+        sendSingle: (RoutedPacket) -> Boolean
+    ): Boolean {
+        val transferId = transferIdFor(routed)
+        val packets = packetsForTransport(routed.packet) ?: return false
+        val total = packets.size
+
+        if (total <= 1) {
+            if (transferId != null) {
+                TransferProgressManager.start(transferId, 1)
+            }
+            val sent = sendSingle(routed.copy(packet = packets.first(), transferId = transferId))
+            if (sent && transferId != null) {
+                TransferProgressManager.progress(transferId, 1, 1)
+                TransferProgressManager.complete(transferId, 1)
+            }
+            return sent
+        }
+
+        Log.d(logTag, "Fragmenting packet type ${routed.packet.type} into $total fragments for $description")
+        if (transferId != null) {
+            TransferProgressManager.start(transferId, total)
+        }
+
+        val job = scope.launch(start = CoroutineStart.LAZY) {
+            var sent = 0
+            for (packet in packets) {
+                if (!isActive) return@launch
+                if (transferId != null && transferJobs[transferId]?.isCancelled == true) return@launch
+
+                val fragment = routed.copy(packet = packet, transferId = transferId)
+                val delivered = try {
+                    sendSingle(fragment)
+                } catch (e: Exception) {
+                    Log.e(logTag, "Fragment send failed for $description: ${e.message}", e)
+                    false
+                }
+
+                if (!delivered) {
+                    Log.w(logTag, "Stopping fragmented send for $description after $sent/$total fragments")
+                    return@launch
+                }
+
+                sent += 1
+                if (transferId != null) {
+                    TransferProgressManager.progress(transferId, sent, total)
+                }
+                if (sent < total) {
+                    delay(interFragmentDelayMs)
+                }
+            }
+
+            if (transferId != null) {
+                TransferProgressManager.complete(transferId, total)
+            }
+        }
+
+        if (transferId != null) {
+            transferJobs[transferId] = job
+            job.invokeOnCompletion { transferJobs.remove(transferId, job) }
+        }
+        job.start()
+        return true
+    }
+
+    fun cancelTransfer(transferId: String): Boolean {
+        val job = transferJobs.remove(transferId) ?: return false
+        job.cancel()
+        return true
+    }
+
+    private fun packetsForTransport(packet: BitchatPacket): List<BitchatPacket>? {
+        if (packet.type == MessageType.FRAGMENT.value) {
+            return listOf(packet)
+        }
+
+        val manager = fragmentManager ?: return listOf(packet)
+        return try {
+            val fragments = manager.createFragments(packet)
+            if (fragments.isEmpty()) {
+                Log.e(logTag, "Fragment manager returned no packets for packet type ${packet.type}")
+                null
+            } else {
+                fragments
+            }
+        } catch (e: Exception) {
+            Log.e(logTag, "Fragment creation failed for packet type ${packet.type}: ${e.message}", e)
+            null
+        }
+    }
+
+    private fun transferIdFor(routed: RoutedPacket): String? {
+        routed.transferId?.let { return it }
+        val packet = routed.packet
+        return if (packet.type == MessageType.FILE_TRANSFER.value) {
+            sha256Hex(packet.payload)
+        } else {
+            null
+        }
+    }
+
+    private fun sha256Hex(bytes: ByteArray): String = try {
+        val md = MessageDigest.getInstance("SHA-256")
+        md.update(bytes)
+        md.digest().joinToString("") { "%02x".format(it) }
+    } catch (_: Exception) {
+        bytes.size.toString(16)
+    }
+}

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

@@ -636,7 +636,7 @@ private fun PeerItem(
                             else -> "Routed"
                         },
                         modifier = Modifier.size(16.dp),
-                        tint = if (isWifiAware) Color(0xFF9C27B0) else colorScheme.onSurface.copy(alpha = 0.6f)
+                        tint = colorScheme.onSurface.copy(alpha = 0.6f)
                     )
                 }
 
@@ -673,7 +673,7 @@ private fun PeerItem(
                             imageVector = Icons.Filled.Wifi,
                             contentDescription = "Direct Wi-Fi Aware",
                             modifier = Modifier.size(13.dp),
-                            tint = Color(0xFF9C27B0).copy(alpha = 0.8f)
+                            tint = colorScheme.onSurface.copy(alpha = 0.8f)
                         )
                     }
                 }

app/src/main/java/com/bitchat/android/ui/debug/DebugSettingsSheet.kt

@@ -42,7 +42,10 @@ import com.bitchat.android.core.ui.component.sheet.BitchatSheetTopBar
 import com.bitchat.android.core.ui.component.sheet.BitchatSheetTitle
 
 @Composable
-fun MeshTopologySection(localPeerID: String? = null) {
+fun MeshTopologySection(
+    localPeerID: String? = null,
+    blePeerIDs: Set<String> = emptySet(),
+) {
     val colorScheme = MaterialTheme.colorScheme
     val graphService = remember { MeshGraphService.getInstance() }
     val snapshot by graphService.graphState.collectAsState()
@@ -65,6 +68,7 @@ fun MeshTopologySection(localPeerID: String? = null) {
                     nodes = nodes,
                     edges = edges,
                     wifiAwarePeerIDs = wifiAwarePeerIDs,
+                    blePeerIDs = blePeerIDs,
                     localPeerID = localPeerID,
                     modifier = Modifier
                         .fillMaxWidth()
@@ -225,7 +229,13 @@ fun DebugSettingsSheet(
 
             // Mesh topology visualization (moved below verbose logging)
             item {
-                MeshTopologySection(localPeerID = meshService.myPeerID)
+                val blePeerIDs = remember(connectedDevices) {
+                    connectedDevices.mapNotNull { it.peerID }.toSet()
+                }
+                MeshTopologySection(
+                    localPeerID = meshService.myPeerID,
+                    blePeerIDs = blePeerIDs,
+                )
             }
 
             // GATT controls

app/src/main/java/com/bitchat/android/ui/debug/MeshGraph.kt

@@ -8,6 +8,7 @@ import androidx.compose.foundation.layout.offset
 import androidx.compose.foundation.layout.size
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Wifi
+import androidx.compose.material.icons.outlined.Bluetooth
 import androidx.compose.material3.Icon
 import androidx.compose.runtime.*
 import androidx.compose.ui.Modifier
@@ -37,6 +38,44 @@ private const val DAMPING = 0.85f
 private const val MAX_VELOCITY = 30f
 private const val PULSE_DECAY = 0.05f
 private const val ROUTE_DECAY = 0.02f
+private val EDGE_ICON_OFFSET = 14.dp
+
+private enum class EdgeTransport { WIFI, BLE }
+
+private data class EdgeMarker(val x: Float, val y: Float, val transport: EdgeTransport)
+
+private fun shouldMarkDirectEdge(
+    edge: MeshGraphService.GraphEdge,
+    transportPeerIDs: Set<String>,
+    localID: String?
+): Boolean {
+    if (transportPeerIDs.isEmpty()) return false
+    return if (localID != null) {
+        (edge.a == localID && edge.b in transportPeerIDs) ||
+            (edge.b == localID && edge.a in transportPeerIDs)
+    } else {
+        edge.a in transportPeerIDs || edge.b in transportPeerIDs
+    }
+}
+
+private fun edgeMarkerPosition(
+    x1: Float,
+    y1: Float,
+    x2: Float,
+    y2: Float,
+    offsetPx: Float,
+    sideSign: Float
+): Pair<Float, Float> {
+    val midX = (x1 + x2) / 2f
+    val midY = (y1 + y2) / 2f
+    val dx = x2 - x1
+    val dy = y2 - y1
+    val len = sqrt(dx * dx + dy * dy)
+    if (len < 0.1f) return midX to midY
+    val px = -dy / len * offsetPx * sideSign
+    val py = dx / len * offsetPx * sideSign
+    return (midX + px) to (midY + py)
+}
 
 private class GraphNodeState(
     val id: String,
@@ -219,6 +258,7 @@ fun ForceDirectedMeshGraph(
     nodes: List<MeshGraphService.GraphNode>,
     edges: List<MeshGraphService.GraphEdge>,
     wifiAwarePeerIDs: Set<String> = emptySet(),
+    blePeerIDs: Set<String> = emptySet(),
     localPeerID: String? = null,
     modifier: Modifier = Modifier
 ) {
@@ -417,38 +457,46 @@ fun ForceDirectedMeshGraph(
         val iconSize = 16.dp
         val iconSizePx = with(density) { iconSize.toPx() }
         val halfIconSizePx = iconSizePx / 2f
+        val iconOffsetPx = with(density) { EDGE_ICON_OFFSET.toPx() }
         val localID = localPeerID
-        val shouldMarkWifiEdge: (MeshGraphService.GraphEdge) -> Boolean = { edge ->
-            if (localID != null) {
-                (edge.a == localID && edge.b in wifiAwarePeerIDs) ||
-                    (edge.b == localID && edge.a in wifiAwarePeerIDs)
-            } else {
-                edge.a in wifiAwarePeerIDs || edge.b in wifiAwarePeerIDs
-            }
-        }
 
-        val wifiEdgeMidpoints = tick.let {
-            simulation.edges.mapNotNull { edge ->
+        val edgeMarkers = tick.let {
+            simulation.edges.flatMap { edge ->
                 val n1 = simulation.nodes[edge.a]
                 val n2 = simulation.nodes[edge.b]
-                if (n1 != null && n2 != null && shouldMarkWifiEdge(edge)) {
-                    ((n1.x + n2.x) / 2f) to ((n1.y + n2.y) / 2f)
-                } else {
-                    null
+                if (n1 == null || n2 == null) return@flatMap emptyList()
+
+                val isWifi = shouldMarkDirectEdge(edge, wifiAwarePeerIDs, localID)
+                val isBle = shouldMarkDirectEdge(edge, blePeerIDs, localID)
+                if (!isWifi && !isBle) return@flatMap emptyList()
+
+                val markers = mutableListOf<EdgeMarker>()
+                if (isWifi) {
+                    val (x, y) = edgeMarkerPosition(n1.x, n1.y, n2.x, n2.y, iconOffsetPx, sideSign = 1f)
+                    markers.add(EdgeMarker(x, y, EdgeTransport.WIFI))
                 }
+                if (isBle) {
+                    val side = if (isWifi) -1f else 1f
+                    val (x, y) = edgeMarkerPosition(n1.x, n1.y, n2.x, n2.y, iconOffsetPx, sideSign = side)
+                    markers.add(EdgeMarker(x, y, EdgeTransport.BLE))
+                }
+                markers
             }
         }
 
-        wifiEdgeMidpoints.forEach { (midX, midY) ->
+        edgeMarkers.forEach { marker ->
             Icon(
-                imageVector = Icons.Filled.Wifi,
+                imageVector = when (marker.transport) {
+                    EdgeTransport.WIFI -> Icons.Filled.Wifi
+                    EdgeTransport.BLE -> Icons.Outlined.Bluetooth
+                },
                 contentDescription = null,
-                tint = Color(0xFF9C27B0).copy(alpha = 0.82f),
+                tint = colorScheme.onSurface.copy(alpha = 0.82f),
                 modifier = Modifier
                     .offset {
                         IntOffset(
-                            x = (midX - halfIconSizePx).roundToInt(),
-                            y = (midY - halfIconSizePx).roundToInt()
+                            x = (marker.x - halfIconSizePx).roundToInt(),
+                            y = (marker.y - halfIconSizePx).roundToInt()
                         )
                     }
                     .size(iconSize)