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Neale Pickett 2024-10-24 13:42:16 -06:00
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# Message Format # Protocol
Vail uses [WebSockets](https://en.wikipedia.org/wiki/WebSocket) at https://vail.woozle.org/chat?repeater=Foo. It accepts two subprotocols: both of these provide the same message information, in different encodings. The Vail websockets protocol is described in [protocol.md](https://github.com/nealey/vail/blob/main/docs/protocol.md)
The server will accept packets in either format, but will only send packets in the format described by the subprotocol. The [API demo](https://vail.woozle.org/testing/api-demo.html) will help if you are writing JavaScript.
## Subprotocol `binary.vail.woozle.org` The [protocol demo](https://vail.woozle.org/testing/protocol-demo.html) will help if you are working with Arduino or another language.
Network byte order, "binary" version of a Message structure. To send messages in this format, be sure you specify a binary WebSocket message.
```go
// Message is a single Vail message.
type Message struct {
// Timestamp of this message. Milliseconds since epoch.
Timestamp int64
// Number of connected clients.
Clients uint16
// Message timing in milliseconds.
// Timings alternate between tone and silence.
// For example, `A` could be sent as [80, 80, 240]
Duration []uint16
}
```
## Subprotocol `json.vail.woozle.org`
A JSON encoded version of the message structure.
Be sure to specify a text WebSocket message.
Example:
```json
{
"Timestamp": 1654548878301,
"Clients": 3,
"Duration": [101, 100, 103, 98, 97, 106, 315]
}
```
# How Vail Gets Realtime Morse Code across the Internet # How Vail Gets Realtime Morse Code across the Internet