Add installation instruction file;

Order directories.

rivista/xmpp/instance.py

@@ -0,0 +1,11 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+from slixmpp import ClientXMPP
+
+class XmppInstance(ClientXMPP):
+    def __init__(self, jid, password):
+        super().__init__(jid, password)
+        self.register_plugin('xep_0060')
+        self.connect()
+        # self.process(forever=False)

rivista/xmpp/utilities.py

@@ -0,0 +1,14 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+
+class XmppUtilities:
+
+    def form_a_node_link(pubsub, node):
+        link = 'xmpp:{pubsub}?;node={node}'.format(pubsub=pubsub, node=node)
+        return link
+    
+    def form_an_item_link(pubsub, node, item_id):
+        link = 'xmpp:{pubsub}?;node={node};item={item}'.format(
+            pubsub=pubsub, node=node, item=item_id)
+        return link

rivista/xmpp/xep_0060.py

@@ -0,0 +1,27 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+
+from slixmpp.exceptions import IqError, IqTimeout
+
+class XmppXep0060:
+
+    async def get_node_item(self, pubsub, node, item_id):
+        try:
+          iq = await self.plugin['xep_0060'].get_item(pubsub, node, item_id, timeout=5)
+          return iq
+        except (IqError, IqTimeout) as e:
+          print(e)
+    
+    async def get_node_items(self, pubsub, node):
+        try:
+          iq = await self.plugin['xep_0060'].get_items(pubsub, node, timeout=5)
+          return iq
+        except (IqError, IqTimeout) as e:
+          print(e)
+    
+    async def get_nodes(self, pubsub):
+        try:
+          iq = await self.plugin['xep_0060'].get_nodes(pubsub, timeout=5)
+          return iq
+        except (IqError, IqTimeout) as e:
+          print(e)