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+Beremiz and Beremiz_service connectors 
+======================================
+
+To connect a PLC, Beremiz provides 2 types of connectors :
+ * a Pyro connector
+ * a WAMP connector
+
+To configure the connection, you have to set the *URI_location* in your project Config tab according to this documentation. 
+
+The Pyro connector
+----------------------------
+
+Pyro is an advanced and powerful Distributed Object Technology system written entirely in Python.
+Beremiz_service spawns a Pyro server, serving a PLCObject (see runtime/PLCObject.py). Therefore, Beremiz acts as a Pyro client.
+
+TODO:: link to PLCObject API documentation
+
+URI_location :
+ * LOCAL:// is a facility that starts the PLC service locally and connect Beremiz to it via Pyro.
+   This is intended for use in development stage.
+ * PYRO://<ip:port> normal connection to a remote PLC. PLC default port is 3000.
+ * PYROS://<ip:port> SSL connection to a remote PLC, see below.
+
+more information about Pyro can be found on http://pythonhosted.org//Pyro/1-intro.html
+
+===========================
+Setup a Pyro SSL connection
+===========================
+
+Pyro v3 has a limited TLS/SSL support based on m2crypto. Pyro v4 had dropped it.
+In order to have a full and reliable SSL, we recommand to use a TLS/SSL wrapper as nginx, stub or stunnel.
+
+--------------------
+TLS-PSK with stunnel
+--------------------
+
+In this example, we setup a simple TLS-PSK connection according to rfc4279.
+This ciphersuite avoid the need for public key operations and certificate management.
+It is perfect for a performance-constrained environments with limited CPU power as a PLC.
+
+
+Needed :
+ * stunnel >= 5.09
+
+verify openssl support for PSK cipher::
+
+    openssl ciphers -v 'PSK'
+
+----------------------
+Client setup (Beremiz)
+----------------------
+
+You need to choose an identity for your client, here *client1*.
+generate a valid and strong key::
+
+    $ echo client1:$(openssl rand -base64 48) > pskclient1.txt
+
+write a stunnel client configuration file *stunnel-client.conf*::
+
+    output = stunnel-client.log
+    client = yes
+    
+    [beremiz]
+    accept = 3002
+    connect = [PLC]:3001
+    PSKidentity = client1
+    PSKsecrets = pskclient1.txt
+
+start stunnel client side::
+
+    stunnel stunnel-client.conf
+
+You could now connect beremiz with classic URI_location = PYRO://127.0.0.1:3002
+
+--------------------
+Server setup (PLC)
+--------------------
+
+import the client key in a keyfile psk.txt, concatening all client key.
+
+write a stunnel server  configuration file *stunnel-server.conf*::
+
+    output = stunnel-server.log
+    
+    [beremiz]
+    accept = 3001
+    connect = 127.0.0.1:3000
+    PSKsecrets = psk.txt
+
+start stunnel server side::
+
+    stunnel stunnel-server.conf
+    
+more documentation on stunnel http://www.stunnel.org/docs.html
+
+The WAMP connector
+------------------
+
+WAMP is an open standard WebSocket subprotocol that provides two application messaging 
+patterns in one unified protocol: Remote Procedure Calls + Publish & Subscribe.
+
+Beremiz WAMP connector implementation uses Autobahn and crossbar.
+
+URI_location :
+	* WAMP://127.0.0.1:8888#Automation#2534667845
+
+more information about WAMP can be found on http://wamp.ws/