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import dgram from "node:dgram";
export class XPlane {
constructor(xplaneAddr = "localhost", xplanePort = 49000) {
this.socket = dgram.createSocket("udp4");
this.subscribed = [];
this.xplaneAddr = xplaneAddr;
this.xplanePort = xplanePort;
this.socket.on("message", (msg, rinfo) => {
if (msg.subarray(0, 5).toString() != "RREF,") {
console.info("dropping unrelated message");
return;
}
let num = (msg.length - 5) / 8;
for (let i = 0; i < num; i++) {
const idx = msg.readInt32LE(5 + i * 8);
if (idx < 0) {
console.info(`sender index ${idx} should be >= 0`);
return;
}
if (idx >= this.subscribed.length) {
console.info(`sender index ${idx} > subscribed.length`);
return;
}
const v = msg.readFloatLE(9 + i * 8);
//console.info(`${this.subscribed[idx].ref} = ${v}`);
this.subscribed[idx].handler(v);
}
});
this.socket.bind(0);
}
async subscribeDataRef(dataRef, freq, handler) {
const idx = this.subscribed.length;
if (handler) {
this.subscribed.push({ ref: dataRef, handler });
}
let buffer = Buffer.alloc(4 + 1 + 4 * 2 + 400);
let off = buffer.write("RREF");
off = buffer.writeUInt8(0, off); // null terminated
off = buffer.writeInt32LE(freq, off); // xint frequency
off = buffer.writeInt32LE(idx, off); // xint sender index
off += buffer.write(dataRef, off); // char[400] dataref
off = buffer.writeUInt8(0, off); // null terminated
console.info(`x-plane subscribed[${idx}] => ${dataRef}`);
await this.socket.send(
buffer,
0,
buffer.length,
this.xplanePort,
this.xplaneAddr,
);
}
//subscribeDataRef("sim/flightmodel/position/indicated_airspeed");
async sendCommand(cmd) {
let buffer = Buffer.alloc(4 + 1 + cmd.length + 1);
let off = buffer.write("CMND");
off = buffer.writeUInt8(0, off); // null terminated
off += buffer.write(cmd, off); // command
off = buffer.writeUInt8(0, off); // null terminated
console.info(`x-plane cmd: ${cmd}`);
await this.socket.send(
buffer,
0,
buffer.length,
this.xplanePort,
this.xplaneAddr,
);
}
//sendCommand("sim/GPS/g1000n1_hdg_down");
}
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