FE-958: Fix registration errors

The callback for startNetworkFollower() was being called after the network follower started, but before UD was initialized. I've updated to call site of the callback so it's only called once network follower AND ud are ready.

I've also added verbose logging, and 30s of retry logic if for some reason, network follower & UD don't get running on the first try.

app/src/main/java/io/xxlabs/messenger/repository/client/ClientRepository.kt

@@ -501,6 +501,7 @@ class ClientRepository @Inject constructor(
         return Single.create { emitter ->
             try {
                 if (!areNodesReady()) {
+                    Timber.d("Failed to register-- nodes aren't ready.")
                     emitter.onError(throwNodeError())
                     return@create
                 }
@@ -512,6 +513,7 @@ class ClientRepository @Inject constructor(
                 exportUserContact()
                 emitter.onSuccess(username)
             } catch (e: Exception) {
+                Timber.d("Failed to register: ${e.message}")
                 emitter.onError(e)
             }
         }
@@ -959,7 +961,11 @@ class ClientRepository @Inject constructor(
         val status = try {
              clientWrapper.getNodeRegistrationStatus()
         } catch (e: Exception) {
-            if (e.isNodeError()) return false
+            return if (e.isNodeError()) {
+                Timber.d("Network is not healthy. Waiting $NODES_READY_POLL_INTERVAL before retry.")
+                Thread.sleep(NODES_READY_POLL_INTERVAL)
+                recursiveAreNodesReady()
+            }
             else throw e
         }
 
@@ -967,6 +973,10 @@ class ClientRepository @Inject constructor(
         Timber.v("[NODE REGISTRATION STATUS] Registration rate: $rate")
 
         return if (rate < NODES_READY_MINIMUM_RATE && retries <= NODES_READY_MAX_RETRIES) {
+            Timber.d(
+                "Nodes not ready after ${retries + 1} attempts. " +
+                        "Waiting $NODES_READY_POLL_INTERVAL before next retry."
+            )
             Thread.sleep(NODES_READY_POLL_INTERVAL)
             recursiveAreNodesReady(retries+1)
         } else {