iot-message 0.1.0

#IOT:1

My custom protocol for communication between devices at home.
It uses UPD and broadcast.
Messages are json strings.

## Message body:

{
"protocol": "iot:1",
"node": "Rpi-lcd-1",
"chip_id": "RpiB",
"event": "lcd.content",
"parameters: [
"content": "-(=^.^)"
],
"response": '',
"targets": [
"nodemcu-lcd-40x4"
]
}

- protocol: defines name, currently iot:1
- node: friendly node name like light-room-big or screen-one-kitchen
- chip_id: a unique device id
- event: event name like light.on or dispay
- parameters: array of parameters. like rows to display
- response: used when responding to request, ie returning toilet state
- targets: message targets by nde name. special keyword ALL for all nodes in network

## functions

### Message(node, chip_id=None)

Create instance of class. Node is a node name, chip_id if blank will be generated

### prepare_message(data=None)

Returns empty message dictionary. If data is passed it copy values from it.

### decode_message(string)

Decode json string to dict message. Validates protocol and targets.
Return None on failure