detect UUID to warn firmware is too old

app/src/main/java/com/geeksville/mesh/MainActivity.kt

@@ -40,6 +40,7 @@ import com.geeksville.mesh.model.BluetoothViewModel
 import com.geeksville.mesh.model.ChannelSet
 import com.geeksville.mesh.model.DeviceVersion
 import com.geeksville.mesh.model.UIViewModel
+import com.geeksville.mesh.repository.radio.BluetoothInterface
 import com.geeksville.mesh.repository.radio.RadioInterfaceService
 import com.geeksville.mesh.repository.radio.SerialInterface
 import com.geeksville.mesh.service.*
@@ -416,6 +417,7 @@ class MainActivity : BaseActivity(), Logging {
 
     /** Show an alert that may contain HTML */
     private fun showAlert(titleText: Int, messageText: Int) {
+
         // make links clickable per https://stackoverflow.com/a/62642807
         // val messageStr = getText(messageText)
 
@@ -476,6 +478,8 @@ class MainActivity : BaseActivity(), Logging {
                                 }
                             }
                         }
+                    } else if (BluetoothInterface.invalidVersion) {
+                        showAlert(R.string.firmware_too_old, R.string.firmware_old)
                     }
                 } catch (ex: RemoteException) {
                     warn("Abandoning connect $ex, because we probably just lost device connection")

app/src/main/java/com/geeksville/mesh/repository/radio/BluetoothInterface.kt

@@ -99,6 +99,10 @@ class BluetoothInterface(
         /// this service UUID is publically visible for scanning
         val BTM_SERVICE_UUID: UUID = UUID.fromString("6ba1b218-15a8-461f-9fa8-5dcae273eafd")
 
+        var invalidVersion = false
+        val EOL_FROMRADIO_CHARACTER: UUID =
+            UUID.fromString("8ba2bcc2-ee02-4a55-a531-c525c5e454d5")
+
         val BTM_FROMRADIO_CHARACTER: UUID =
             UUID.fromString("2c55e69e-4993-11ed-b878-0242ac120002")
         val BTM_TORADIO_CHARACTER: UUID =
@@ -149,6 +153,7 @@ class BluetoothInterface(
             ?: throw RadioNotConnectedException("BLE service not found")
 
     private lateinit var fromNum: BluetoothGattCharacteristic
+    private lateinit var fromRadio: BluetoothGattCharacteristic
 
     /**
      * With the new rev2 api, our first send is to start the configure readbacks.  In that case,
@@ -228,7 +233,6 @@ class BluetoothInterface(
     /// Attempt to read from the fromRadio mailbox, if data is found broadcast it to android apps
     private fun doReadFromRadio(firstRead: Boolean) {
         safe?.let { s ->
-            val fromRadio = getCharacteristic(BTM_FROMRADIO_CHARACTER)
             s.asyncReadCharacteristic(fromRadio) {
                 try {
                     val b = it.getOrThrow()
@@ -357,6 +361,13 @@ class BluetoothInterface(
 
                             fromNum = getCharacteristic(BTM_FROMNUM_CHARACTER)
 
+                            // We changed UUIDs to be able to identify old firmware (<1.3.43)
+                            fromRadio = if (bservice.characteristics.map { it.uuid }
+                                    .contains(EOL_FROMRADIO_CHARACTER)) {
+                                invalidVersion = true
+                                getCharacteristic(EOL_FROMRADIO_CHARACTER)
+                            } else getCharacteristic(BTM_FROMRADIO_CHARACTER)
+
                             // We treat the first send by a client as special
                             isFirstSend = true
 

app/src/main/java/com/geeksville/mesh/service/MeshService.kt

@@ -1391,6 +1391,9 @@ class MeshService : Service(), Logging {
         configNonce += 1
         newNodes.clear()
         newMyNodeInfo = null
+
+        if (BluetoothInterface.invalidVersion) onHasSettings() // Device firmware is too old
+
         debug("Starting config nonce=$configNonce")
 
         sendToRadio(ToRadio.newBuilder().apply {