Update some log statements, add a comment on slow host loading.

README.md

@@ -145,6 +145,18 @@ If you use the "Add/Update" feature when prompted by rMview (for example after a
 :warning: **Key format error:**
 If you get an error when connect using a key, but the key seems ok when connecting manually with ssh, you probably need to convert the key to the PEM format (or re-generate it using the `-m PEM` option of `ssh-keygen`). See [here](https://github.com/paramiko/paramiko/issues/340#issuecomment-492448662) for details.
 
+NOTE: If you have a lot of known hosts in system known hosts file (`~/.ssh/known_hosts`), you are advised to add
+known host entry for remarkable to `~/.config/rmview_known_hosts` because paramiko can be very slow when loading
+large known hosts file which slows down the whole connection routine.
+
+If your user system known hosts file already contains entry for remarkable, you can add it to rmview specific
+hosts file using this command:
+
+```bash
+cat ~/.ssh/known_hosts | grep 10.11.99.1 >> ~/.config/rmview_known_hosts
+```
+
+You should of course replace IP with your remarkable IP.
 
 ## To Do
 

src/rmview/connection.py

@@ -76,15 +76,18 @@ class rMConnect(QRunnable):
 
       if host_key_policy != "ignore_all":
         if known_hosts and os.path.isfile(known_hosts):
+          log.info("Using known hosts file: %s" % (known_hosts))
           self.client.load_host_keys(known_hosts)
           log.info("LOADED %s", known_hosts)
         else:
+          log.info("Using system default known hosts file")
           # ideally we would want to always load the system ones
           # and have the local keys have precedence, but paramiko gives
           # always precedence to system keys
+          # There is extremly slow in system with many known host entries... :/
+          # See https://github.com/paramiko/paramiko/issues/191
           self.client.load_system_host_keys()
 
-
       policy = HOST_KEY_POLICY.get(host_key_policy, RejectNewHostKey)
       self.client.set_missing_host_key_policy(policy())
 

src/rmview/workers.py

@@ -101,6 +101,7 @@ class FrameBufferWorker(QRunnable):
 
   @pyqtSlot()
   def run(self):
+    log.info("Starting VNC server")
     try:
       _,_,out = self.ssh.exec_command("$HOME/rM-vnc-server-standalone")
       log.info(next(out))
@@ -108,7 +109,7 @@ class FrameBufferWorker(QRunnable):
       self.signals.onFatalError.emit(e)
 
     while self._stop == False:
-      log.info("Starting VNC server")
+      log.info("Establishing connection to remote VNC server")
       try:
         self.vncClient = internet.TCPClient(self.ssh.hostname, 5900, RFBFactory(self.signals))
         self.vncClient.startService()