diff --git a/app/src/main/java/com/geeksville/mesh/MainActivity.kt b/app/src/main/java/com/geeksville/mesh/MainActivity.kt
index bfa50f18e..669db59b7 100644
--- a/app/src/main/java/com/geeksville/mesh/MainActivity.kt
+++ b/app/src/main/java/com/geeksville/mesh/MainActivity.kt
@@ -548,7 +548,18 @@ class MainActivity : AppCompatActivity(), Logging,
                 model.radioConfig.value =
                     MeshProtos.RadioConfig.parseFrom(service.radioConfig)
 
-                model.myNodeInfo.value = service.myNodeInfo
+                val info = service.myNodeInfo
+                model.myNodeInfo.value = info
+
+                val isOld = info.minAppVersion > BuildConfig.VERSION_CODE
+                if (isOld)
+                    MaterialAlertDialogBuilder(this)
+                        .setTitle(getString(R.string.app_too_old))
+                        .setMessage(getString(R.string.must_update))
+                        .setPositiveButton("Okay") { _, _ ->
+                            info("User acknowledged app is old")
+                        }
+                        .show()
 
                 updateNodesFromDevice()
 
diff --git a/app/src/main/java/com/geeksville/mesh/MyNodeInfo.kt b/app/src/main/java/com/geeksville/mesh/MyNodeInfo.kt
index ef3d37ef7..e5a447b1c 100644
--- a/app/src/main/java/com/geeksville/mesh/MyNodeInfo.kt
+++ b/app/src/main/java/com/geeksville/mesh/MyNodeInfo.kt
@@ -17,7 +17,8 @@ data class MyNodeInfo(
     val currentPacketId: Long,
     val nodeNumBits: Int,
     val packetIdBits: Int,
-    val messageTimeoutMsec: Int
+    val messageTimeoutMsec: Int,
+    val minAppVersion: Int
 ) : Parcelable {
     /** A human readable description of the software/hardware version */
     val firmwareString: String get() = "$model $region/$firmwareVersion"
@@ -33,6 +34,7 @@ data class MyNodeInfo(
         parcel.readLong(),
         parcel.readInt(),
         parcel.readInt(),
+        parcel.readInt(),
         parcel.readInt()
     ) {
     }
@@ -49,6 +51,7 @@ data class MyNodeInfo(
         parcel.writeInt(nodeNumBits)
         parcel.writeInt(packetIdBits)
         parcel.writeInt(messageTimeoutMsec)
+        parcel.writeInt(minAppVersion)
     }
 
     override fun describeContents(): Int {
diff --git a/app/src/main/java/com/geeksville/mesh/model/MessagesState.kt b/app/src/main/java/com/geeksville/mesh/model/MessagesState.kt
index f35f8c2fd..cdb4c353b 100644
--- a/app/src/main/java/com/geeksville/mesh/model/MessagesState.kt
+++ b/app/src/main/java/com/geeksville/mesh/model/MessagesState.kt
@@ -5,9 +5,7 @@ import androidx.lifecycle.MutableLiveData
 import com.geeksville.android.BuildUtils.isEmulator
 import com.geeksville.android.Logging
 import com.geeksville.mesh.DataPacket
-import com.geeksville.mesh.MeshProtos
 import com.geeksville.mesh.MessageStatus
-import com.geeksville.mesh.utf8
 
 
 class MessagesState(private val ui: UIViewModel) : Logging {
@@ -31,12 +29,14 @@ class MessagesState(private val ui: UIViewModel) : Logging {
 
     /// add a message our GUI list of past msgs
     fun addMessage(m: DataPacket) {
+        debug("Adding message to view id=${m.id}")
         // FIXME - don't just slam in a new list each time, it probably causes extra drawing.
         messages.value = messages.value!! + m
     }
 
     fun updateStatus(id: Int, status: MessageStatus) {
         // Super inefficent but this is rare
+        debug("Handling message status change $id: $status")
         val msgs = messages.value!!
 
         msgs.find { it.id == id }?.let { p ->
@@ -55,11 +55,8 @@ class MessagesState(private val ui: UIViewModel) : Logging {
     fun sendMessage(str: String, dest: String = DataPacket.ID_BROADCAST) {
 
         val service = ui.meshService
-        val p = DataPacket(
-            dest,
-            str.toByteArray(utf8),
-            MeshProtos.Data.Type.CLEAR_TEXT_VALUE
-        )
+        val p = DataPacket(dest, str)
+
         if (service != null)
             try {
                 service.send(p)
@@ -69,6 +66,7 @@ class MessagesState(private val ui: UIViewModel) : Logging {
         else
             p.errorMessage = "Error: No Mesh service"
 
+        // FIXME - why is the first time we are called p is already in the list at this point?
         addMessage(p)
     }
 }
diff --git a/app/src/main/java/com/geeksville/mesh/service/MeshService.kt b/app/src/main/java/com/geeksville/mesh/service/MeshService.kt
index d62e6d30f..6ee667a09 100644
--- a/app/src/main/java/com/geeksville/mesh/service/MeshService.kt
+++ b/app/src/main/java/com/geeksville/mesh/service/MeshService.kt
@@ -1228,7 +1228,8 @@ class MeshService : Service(), Logging {
                 currentPacketId.toLong() and 0xffffffffL,
                 if (nodeNumBits == 0) 8 else nodeNumBits,
                 if (packetIdBits == 0) 8 else packetIdBits,
-                if (messageTimeoutMsec == 0) 5 * 60 * 1000 else messageTimeoutMsec // constants from current device code
+                if (messageTimeoutMsec == 0) 5 * 60 * 1000 else messageTimeoutMsec, // constants from current device code
+                minAppVersion
             )
         }
 
@@ -1543,8 +1544,6 @@ class MeshService : Service(), Logging {
                     "num_data_sent",
                     DataPair(1)
                 )
-
-                connectionState == ConnectionState.CONNECTED
             }
         }
 
diff --git a/app/src/main/proto b/app/src/main/proto
index e9c7f9b95..9d083d5d4 160000
--- a/app/src/main/proto
+++ b/app/src/main/proto
@@ -1 +1 @@
-Subproject commit e9c7f9b95d490aea3f0f213d4666d2dbf7e2111c
+Subproject commit 9d083d5d4ff4ef095135b18468004eaba77cb691
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0976c025a..900780f9d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -59,4 +59,6 @@
     <string name="not_connected">Not connected, select radio below</string>
     <string name="connected_sleeping">Connected to radio, but it is sleeping</string>
     <string name="update_to">Update to %s</string>
+    <string name="app_too_old">Application too old</string>
+    <string name="must_update">You must update this application on the Google Play store (or Github). It is too old to talk to this radio.</string>
 </resources>
diff --git a/geeksville-androidlib b/geeksville-androidlib
index a7b2f9534..62172dbfa 160000
--- a/geeksville-androidlib
+++ b/geeksville-androidlib
@@ -1 +1 @@
-Subproject commit a7b2f95341876ae96525c9cd38fa2fa0cc833351
+Subproject commit 62172dbfa2d85a389f6edaea6b416663e8bf4d2c
diff --git a/images/app-too-old.png b/images/app-too-old.png
new file mode 100644
index 000000000..92f98b778
Binary files /dev/null and b/images/app-too-old.png differ