Save messages in CSV and fix position broadcast

app/src/main/java/com/geeksville/mesh/database/dao/PacketDao.kt

@@ -9,7 +9,7 @@ import com.geeksville.mesh.database.entity.Packet
 @Dao
 interface PacketDao {
 
-    @Query("Select * from packet order by rowid desc limit 0,:maxItem")
+    @Query("Select * from packet order by received_date desc limit 0,:maxItem")
     fun getAllPacket(maxItem: Int): LiveData<List<Packet>>
 
     @Insert

app/src/main/java/com/geeksville/mesh/database/entity/Packet.kt

@@ -3,6 +3,10 @@ package com.geeksville.mesh.database.entity
 import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.PrimaryKey
+import com.geeksville.mesh.MeshProtos
+import com.geeksville.mesh.Portnums
+import com.google.protobuf.TextFormat
+import java.io.IOException
 
 
 @Entity(tableName = "packet")
@@ -12,6 +16,25 @@ data class Packet(@PrimaryKey val uuid: String,
                   @ColumnInfo(name = "message") val raw_message: String
 ) {
 
-
-
+    val proto: MeshProtos.MeshPacket?
+        get() {
+            if (message_type == "packet") {
+                val builder = MeshProtos.MeshPacket.newBuilder()
+                try {
+                    TextFormat.getParser().merge(raw_message, builder)
+                    return builder.build()
+                } catch (e: IOException) {
+                }
+            }
+            return null
+        }
+    val position: MeshProtos.Position?
+        get() {
+            return proto?.run {
+                if (hasDecoded() && decoded.portnumValue == Portnums.PortNum.POSITION_APP_VALUE) {
+                    return MeshProtos.Position.parseFrom(decoded.payload)
+                }
+                return null
+            }
+        }
 }