Lora ST127x main example

main.js

import Timer from "timer";
import LoRa_ST127x, { LoRa_Heltec_Wifi_Lora_32_v2_pins } from "lora_st127x";
import config from "mc/config";

let lora;

// test settings
const transmit = parseInt(config.transmit ?? "0"); // true to transmit, false to receive
const useReadCallback = true; // true to use callbacks on read, false to use polling
const usePreallocatedBuffer = true; // set to true to test preallocated buffers, false to test dynamic allocation buffers (when useReadCallback is false)

if (transmit) trace("\nTransmit mode\n\n");
else trace("\nReceive mode\n\n");

init();
let t = Timer.repeat(loop, transmit ? 1000 : 10);
let receiveBuffer = new ArrayBuffer(250);
let id = 0;

function init() {
	lora = new LoRa_ST127x({
		...LoRa_Heltec_Wifi_Lora_32_v2_pins,
		onReadable: () => {
			if (!transmit) {
				if (useReadCallback) {
					let size = lora.read(receiveBuffer);
					if (undefined === size) trace("Read callback but no data waiting\n");
					else trace(`Received ${size} bytes: ${String.fromArrayBuffer(receiveBuffer)}\n`);
				} else trace("onReadable\n");
			}
		},
		onWritable: () => {
			trace("onWritable\n");
		},
	});
}

function loop() {
	if (transmit) {
		let message = "hello #" + ++id;
		let buffer = ArrayBuffer.fromString(message);
		trace(`Sending ${buffer.byteLength} bytes: ${String.fromArrayBuffer(buffer)}\n`);
		lora.write(buffer);
	} else if (!useReadCallback) {
		if (usePreallocatedBuffer) {
			let bytesReceived = lora.read(receiveBuffer);
			if (bytesReceived) trace(`Received ${bytesReceived} bytes: ${String.fromArrayBuffer(receiveBuffer)}\n`);
		} else {
			let buf = lora.read(50);
			if (buf) trace(`Received ${buf.byteLength} bytes: ${String.fromArrayBuffer(buf)}\n`);
		}
	}
}