From a00aa40e36ce062ed0aa34d5a20daab6a8f20a41 Mon Sep 17 00:00:00 2001
From: Brent Petit <bjpetit@users.noreply.github.com>
Date: Wed, 8 Jan 2025 08:58:21 -0600
Subject: [PATCH] Update traceroute back route display to handle case where
 route back is not valid

---
 Meshtastic/Helpers/BLEManager.swift        | 29 +++++++++++-----------
 Meshtastic/Views/Nodes/TraceRouteLog.swift |  2 +-
 2 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/Meshtastic/Helpers/BLEManager.swift b/Meshtastic/Helpers/BLEManager.swift
index 2bba29c7..b542ca0e 100644
--- a/Meshtastic/Helpers/BLEManager.swift
+++ b/Meshtastic/Helpers/BLEManager.swift
@@ -903,10 +903,11 @@ class BLEManager: NSObject, CBPeripheralDelegate, MqttClientProxyManagerDelegate
 					/// Add the destination node to the end of the route towards string and the beginning of the route back string
 					routeString += "\(traceRoute?.node?.user?.longName ?? "unknown".localized) \((traceRoute?.node?.num ?? 0).toHex()) (\(destinationHop.snr != -32 ? String(destinationHop.snr) : "unknown ".localized)dB)"
 					traceRoute?.routeText = routeString
-
-					traceRoute?.hopsBack = Int32(routingMessage.routeBack.count)
+					// Default to -1 only fill in if routeBack is valid below
+					traceRoute?.hopsBack = -1
 					// Only if hopStart is set and there is an SNR entry
 					if decodedInfo.packet.hopStart > 0 && routingMessage.snrBack.count > 0 {
+						traceRoute?.hopsBack = Int32(routingMessage.routeBack.count)
 						var routeBackString = "\(traceRoute?.node?.user?.longName ?? "unknown".localized) \((traceRoute?.node?.num ?? 0).toHex()) --> "
 						for (index, node) in routingMessage.routeBack.enumerated() {
 							var hopNode = getNodeInfo(id: Int64(node), context: context)
@@ -947,19 +948,19 @@ class BLEManager: NSObject, CBPeripheralDelegate, MqttClientProxyManagerDelegate
 						let snrBackLast = Float(routingMessage.snrBack.last ?? -128) / 4
 						routeBackString += "\(connectedNode.user?.longName ?? String(connectedNode.num.toHex())) (\(snrBackLast != -32 ? String(snrBackLast) : "unknown ".localized)dB)"
 						traceRoute?.routeBackText = routeBackString
-						traceRoute?.hops = NSOrderedSet(array: hopNodes)
-						traceRoute?.time = Date()
-						do {
-							try context.save()
-							Logger.data.info("💾 Saved Trace Route")
-						} catch {
-							context.rollback()
-							let nsError = error as NSError
-							Logger.data.error("Error Updating Core Data TraceRouteHop: \(nsError, privacy: .public)")
-						}
-						let logString = String.localizedStringWithFormat("mesh.log.traceroute.received.route %@".localized, routeString)
-						MeshLogger.log("🪧 \(logString)")
 					}
+					traceRoute?.hops = NSOrderedSet(array: hopNodes)
+					traceRoute?.time = Date()
+					do {
+						try context.save()
+						Logger.data.info("💾 Saved Trace Route")
+					} catch {
+						context.rollback()
+						let nsError = error as NSError
+						Logger.data.error("Error Updating Core Data TraceRouteHop: \(nsError, privacy: .public)")
+					}
+					let logString = String.localizedStringWithFormat("mesh.log.traceroute.received.route %@".localized, routeString)
+					MeshLogger.log("🪧 \(logString)")
 				}
 			case .neighborinfoApp:
 				if let neighborInfo = try? NeighborInfo(serializedBytes: decodedInfo.packet.decoded.payload) {
diff --git a/Meshtastic/Views/Nodes/TraceRouteLog.swift b/Meshtastic/Views/Nodes/TraceRouteLog.swift
index 1bdccf46..f10dad58 100644
--- a/Meshtastic/Views/Nodes/TraceRouteLog.swift
+++ b/Meshtastic/Views/Nodes/TraceRouteLog.swift
@@ -44,7 +44,7 @@ struct TraceRouteLog: View {
 									.font(.caption)
 							} else if route.response {
 								let hopTowardsString = String(localized: "\(route.hopsTowards) Hops")
-								let hopBackString = String(localized: "\(route.hopsBack) Hops")
+								let hopBackString = route.hopsBack >= 0 ? String(localized: "\(route.hopsBack) Hops") : String(localized: "unknown")
 								Text("\(routeTime) - \(hopTowardsString) Towards  \(hopBackString) Back")
 									.font(.caption)
 							} else if route.sent {