Communication protocol

Nile offers two communcation protocols:

Message elements

Channel: specifies who is communicating with whom
- websockets: it is rappresented by the name of the event
  - syntax: "sender.to.recipient"
```
ws.emit("node.to.client", {}})
```
- http: it is rappresented by the path
  - syntax: "sender.to.recipient"
```
http://localinstance/node/to/client
```
Properties (JSON): The properties of the channel
- instance.to.node, instance/to/node:
  - action: the called action
  - parameters: the properties of the action
- instance.to.client:
  - action: the called action
  - parameters: the properties of the action
- instance.to.client.from.node
  - response: the response
  - sender: the node id
- instance.to.node.from.client
  - response: the response
  - sender: the node id
- node.to.instance, /node/to/instance:
  - action: the called action
  - parameters: the properties of the action
- node.to.instance.for.client
  - response: the response
  - recipient: the client id
- client.to.instance
  - action: the called action
  - parameters: the properties of the action
- client.to.instance.for.node
  - response: the response
  - sender: the node id