- better command input handling in python server (empty string as out…

…put value)

- added links in Readme

README.md

@@ -5,7 +5,7 @@ Python/Websocket based RevPi Nodes for Node-RED.
 Server
 ------
 > The server is needed to communicate between the Node-RED RevPi nodes and the I/O pins on the RevPi. 
-It is a Python based websocket server which utilizes the Python library [RevPiModIO](https://revpimodio.org/) to interface between the RevPi process image and Node-RED. The associated RevPi nodes can be acquired via the node-red-contrib-revpi-nodes package in the Node-RED Library or [here](https://github.com/erminas/node-red-contrib-revpi-nodes).
+It is a Python based websocket server which utilizes the Python library [RevPiModIO](https://revpimodio.org/) to interface between the RevPi process image and Node-RED. The associated RevPi nodes can be acquired via the [node-red-contrib-revpi-nodes package](https://flows.nodered.org/node/node-red-contrib-revpi-nodes) in the Node-RED Library or [here](https://github.com/erminas/node-red-contrib-revpi-nodes).
 
 ### Installation
 1. Install the server with the following command:

revpi-server.py

@@ -166,9 +166,15 @@ def handle_websocket_message(self, client, server, message):
             server.send_message(client, message + ";" + json.dumps(self.get_io_list()))
         elif command == "output":  # write to pin
             if isinstance(self.revpi.io[args[0]].value, bool):
-                val = bool(int(args[1]))
+                try:
+                    val = bool(int(args[1]))
+                except ValueError:
+                    val = False
             elif isinstance(self.revpi.io[args[0]].value, int):
-                val = int(args[1])
+                try:
+                    val =  int(args[1])
+                except ValueError:
+                    val = 0
             else:
                 val = args[1]