Add support for map format messages

- Added handling for topics with "map" format (2/map)
- Display map data as readable text rather than hex
- Added new FormatTopicAndMapData function to formatter.go
- Added map format condition in main.go message handler

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

decoder/formatter.go

@@ -846,6 +846,32 @@ func FormatTopicAndJSONData(topicInfo *TopicInfo, jsonData map[string]interface{
 	return builder.String()
 }
 
+// FormatTopicAndMapData formats topic information and map data as text
+func FormatTopicAndMapData(topicInfo *TopicInfo, payload []byte) string {
+	var builder strings.Builder
+	
+	// Display topic information
+	builder.WriteString(fmt.Sprintf("Topic: %s\n", topicInfo.FullTopic))
+	builder.WriteString(fmt.Sprintf("Region Path: %s\n", topicInfo.RegionPath))
+	builder.WriteString(fmt.Sprintf("Version: %s\n", topicInfo.Version))
+	builder.WriteString(fmt.Sprintf("Format: %s\n", topicInfo.Format))
+	builder.WriteString(fmt.Sprintf("Channel: %s\n", topicInfo.Channel))
+	if topicInfo.UserID != "" {
+		builder.WriteString(fmt.Sprintf("User ID: %s\n", topicInfo.UserID))
+	}
+	builder.WriteString("\n")
+	
+	// Display map data as text
+	builder.WriteString("Map Data:\n")
+	if IsASCII(payload) {
+		builder.WriteString(fmt.Sprintf("  Text Content: %s\n", string(payload)))
+	} else {
+		builder.WriteString(fmt.Sprintf("  Data is not ASCII text, showing hex: %x\n", payload))
+	}
+	
+	return builder.String()
+}
+
 // FormatTopicAndRawData formats topic information and raw data for unsupported formats
 func FormatTopicAndRawData(topicInfo *TopicInfo, payload []byte) string {
 	var builder strings.Builder

main.go

@@ -18,7 +18,7 @@ const (
 	mqttBroker      = "mqtt.bayme.sh"
 	mqttUsername    = "meshdev"
 	mqttPassword    = "large4cats"
-	mqttTopicPrefix = "msh/US"
+	mqttTopicPrefix = "msh/US/bayarea"
 )
 
 var messagePubHandler mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Message) {
@@ -37,7 +37,10 @@ var messagePubHandler mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Me
 			// Binary encoded protobuf message
 			decodedPacket := decoder.DecodeMessage(msg.Payload(), topicInfo)
 			formattedOutput = decoder.FormatTopicAndPacket(topicInfo, decodedPacket)
-		} else if topicInfo.Format == "json" {
+		} else if topicInfo.Format == "map" {
+				// Map format - unencrypted map packets, display as text
+				formattedOutput = decoder.FormatTopicAndMapData(topicInfo, msg.Payload())
+			} else if topicInfo.Format == "json" {
 			// JSON format message
 			jsonData, err := decoder.DecodeJSONMessage(msg.Payload())
 			if err != nil {
@@ -50,7 +53,7 @@ var messagePubHandler mqtt.MessageHandler = func(client mqtt.Client, msg mqtt.Me
 			// Unsupported format
 			formattedOutput = decoder.FormatTopicAndRawData(topicInfo, msg.Payload())
 		}
-		
+
 		// Print the formatted output
 		fmt.Println(formattedOutput)
 	}