Difference between revisions of "ChronoCloud 2"

Revision as of 22:29, 15 December 2017

ChronoCloud 2 protocol enables other applications to aquire real time timing data from ChronoFly.

Application is required to establish a WebSocket server where ChronoFly can send real time timing data.

1 WebSocket server example
2 Protocol
3 Supported station types

WebSocket server example

NodeJs

var ws = require("nodejs-websocket");

var server = ws.createServer(function(conn) {
    var station;
    conn.on("text", function(msg) {
        var dataObject = JSON.parse(msg);
        station = dataObject.station;
        conn.sendText("bumb-" + dataObject.data.id);
        console.log(Date() + " got time " + dataObject.data.time);
    });
    conn.on("close", function(code, reason) {
        console.log(Date() + " " + station + " not publishing anymore");
    });
}).listen(8275);

Protocol

Uses WebSocket Draft_6455 and TCP port 8275.

Confirmation rules

Whenever server receives a PDU it is required to confirm it back to the sender (ChronoFly).

Response format is bumb-<data.id>

Example confirmation response

bumb-4291

If PDU is not confirmed back to sender (ChronoFly) it will be re-sent to server during next event cycle.

Example passing PDU

Sent whenever passing (transponder or manual) is registered on ChronoFly.

{
    "station": "ChronoFly-12345",
    "competition": "166656",
    "signature": "c39cfef55ac1b4",
    "data": {
        "event": "passing",
        "id": "70",
        "type": "Route-TC-Finish",
        "round": "ET 4 TC 9 Huhdanoja A",
        "time": "20:47:57.765",
        "transponder": "7",
        "hits": "0",
        "lap": "5"
    }
}

Where

station: ChronoFly station identifier
competition: ChronoFly competition identifier
signature: Data signature based on keys negotiated during ChronoFly registration

event: event type
id: event id (incremented by 1 and zeroed when round changed or tables cleared)
type: station type selected currently at ChronoFly
round: round name selected currently at ChronoFly
time: passing time
transponder: passing transponder number
hits: times same transponder has been seen during current passing event
lap: times same transponder has been seen during selected round (incremented by 1)

Example connection PDU

Sent whenever ChronoFly connects to the WebSocket server.

{
    "station": "ChronoFly-12345",
    "competition": "166656",
    "signature": "642a417f03b2ea",
    "data": {
        "event": "connected",
        "id": "0"
    }
}