Anne und Sebastians Wiki

Step	From	To	Message
1	Client	Hub	HEARTBEAT(0x200\|nr), len=8, data=uptime:32,interval:16,apimajor:8,apiminor:8
2	Hub	Mqtt	'iot/heartbeat/' nr : '{"uptime":' uptime ',"interval":' interval ',"apiversion": apimajor '.' apiminor '}'

Step	From	To	Message
1	Hub	Client	HUBBEAT(0x280), len=8, data=uptime:32,interval:16,0x0010:16
2	Hub	Mqtt	'iot/heartbeat/hub' : '{"uptime":' uptime ',"interval":' interval '}'

Step	From	To	Message
1	Client	Hub	JSON(0x240\|nr), len=8, data=json
n-1	Client	Hub	JSON(0x240\|nr), len=8, data=json
n	Client	Hub	JSON(0x240\|nr), len=6/7, data=frames:16, crc:16, jsonlen:16 [,heading=status(0),update(1):8]
n+1	Hub	Mqtt	'iot/status/'/'iot/update/' nr : json

Step	From	To	Message
1	Mqtt	Hub	'iot/set/' nr : json
2	Hub	Client	JSON(0x240\|nr), len=8, data=json
n-1	Hub	Client	JSON(0x240\|nr), len=8, data=json
n	Hub	Client	JSON(0x240\|nr), len=6/7, data=frames:16, crc:16, jsonlen:16[,heading=set(2):8]

Note:

The crc of the JSON completion frame pertains to all data frames for len=6, plus the completion frame itself (with the crc set to 0) for len=7
Expect clients to have only a limited amount of memory at hand to process incoming JSON requests.
Expect clients to implement only a limited form of JSON parsing, for instance only allowing integer numbers or strings as values.
TODO: Are clients able to receive JSON data at high pace? Otherwise either the Hub should throttle or ACKs should be introduced.
TODO: Include frames and jsonlen of last frame into crc.

Step	From	To	Message
1	Hub	Mqtt	'iot/heartbeat/hub': '{"uptime":' uptime ',"interval":' interval '}'

Step	From	To	Message
1	Hub	Mqtt	'iot/status/hub': '{"id":' deviceno ', "hw":"TEENSY40", "type":"mqtthub", "sw": "' sw '"}'