fix: ensure bg loc permissions, unbind service (#2050)

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

@@ -389,6 +389,25 @@ class MainActivity : AppCompatActivity(), Logging {
         )
     }
 
+    private fun unbindMeshService() {
+        // If we have received the service, and hence registered with
+        // it, then now is the time to unregister.
+        // if we never connected, do nothing
+        debug("Unbinding from mesh service!")
+        connectionJob?.let { job ->
+            connectionJob = null
+            warn("We had a pending onConnection job, so we are cancelling it")
+            job.cancel("unbinding")
+        }
+        mesh.close()
+        serviceRepository.setMeshService(null)
+    }
+
+    override fun onStop() {
+        unbindMeshService()
+        super.onStop()
+    }
+
     override fun onStart() {
         super.onStart()
         bluetoothViewModel.enabled.observe(this) { enabled ->