Sergey Lyubka cpq

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Founder, Director at Cesanta. In the past: Engineering Manager at Google, CTO at NetFort

cpq / split.html

Last active November 20, 2021 17:28

HTML split pane layout example

	<html>
	<head>
	<style>
	* { box-sizing: border-box; }
	body, html { padding: 0; margin: 0; }
	.main { height: 100vh; }
	.content { padding: 1em; }

	.split { display: flex; flex-grow: 1; flex-shrink: 1; width: 100%; height: 100%; box-sizing: border-box; }
	.split>* { flex-grow: 1; flex-shrink: 1; width: 100%; height: 100%; overflow: auto; -webkit-overflow-scrolling: touch; }

cpq / cnip_app.c

Last active June 9, 2021 17:55

	// This file contains two sketches for the end-user networking API that implements
	// a simple WS service: WS message with JSON input {"pin": 12, "val": 0}, and JSON response {"status": true}

	// WS handler, streaming API (think AVR)
	// We don't buffer an incoming WS message. Instead, we feed
	// TCP stack, and user handler, byte-by-byte.
	// Some important values from the parsed HTTP header gets stored
	// and passed to the user handler.
	void ws_handler(struct conn *c, int event, size_t content_len, size_t receided_so_far, uint8_t byte) {
	if (event == EVENT_INCOMING_BYTE) {

cpq / cnip.h

Last active June 4, 2021 10:46

CNIP API suggestion

	// The stack has two API: low level and high level
	// Low level: used to hook it up to a hardware, to send/receive MAC frames
	// High level: used to implement network apps, like HTTP/MQTT client/servers.

	// Low level
	// A device code does something like this:
	//
	// void cnip_mac_out(char *buf, size_t len) {
	// bitbang_to_ethernet(buf, len); // Push outgoing frame to the network
	// }

cpq / chunked-server.js

Created March 8, 2021 15:30

	const port = 8002;
	const http = require('http');

	const http_handler = function(req, res) {
	let request = '', count = 0;
	req.on('data', chunk => request += chunk);
	req.on('end', function(ev) {
	res.writeHead(200);
	const f = function() {
	res.write('hi\n');

cpq / preact-minimal.html

Created December 18, 2020 10:52

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title>hiii</title>
	<meta charset="utf-8" />
	<meta http-equiv="X-UA-Compatible" content="IE=edge" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.0/css/bootstrap.min.css" />
	<script src="https://cdnjs.cloudflare.com/ajax/libs/axios/0.19.2/axios.min.js"></script>
	</head>

cpq / catcher.js

Created September 15, 2020 12:47

	// Run this catcher in a following way:
	// 1. Make sure to install tmux, nodejs, and `ws` node package
	// apt-get install tmux npm
	// npm install -g ws
	// 2. Start tmux. This is needed to let the program run after logout.
	// When you log in again, `tmux attach` attaches an old session.
	// 3. Run catcher in an infinite loop:
	// while true; do node catcher.js YOUR_API_KEY ; sleep 1; done

	const Websocket = require('ws'); // npm install -g ws

cpq / devsim.js

Last active September 11, 2020 20:40

	// Simulate mdash.net device. To run this script, install ws library first:
	// $ npm -g i ws
	// $ node devsim.js MDASH_DEVICE_TOKEN

	const Websocket = require('ws'); // npm install -g ws
	const pass = process.argv[2]; // Device password
	const addr = 'wss://mdash.net/api/v2/rpc?access_token=' + pass;
	const ws = new Websocket(addr, {origin: addr});

	ws.on('error', msg => console.log(msg.toString()));

cpq / UartControl.ino

Created August 30, 2020 14:46

	void setup() {
	Serial.begin(115200);
	pinMode(LED_BUILTIN, OUTPUT);
	}

	void loop() {
	if (Serial.available() > 0) {
	int character = Serial.read();
	if (character == '0') digitalWrite(LED_BUILTIN, LOW); // '0' switches LED off
	if (character == '1') digitalWrite(LED_BUILTIN, HIGH); // '1' switches LED on

cpq / passthrough.ino

Created July 4, 2020 08:52

	static int BAUD = 115200, RTS = -1, DTR = -1, ESP32_GPIO = 11, ESP32_RESETN = 12;

	void setup() {
	Serial.begin(baud);
	Serial1.begin(baud);
	pinMode(ESP32_GPIO0, OUTPUT);
	pinMode(ESP32_RESETN, OUTPUT);

	// Reset ESP32, put into upload mode
	digitalWrite(ESP32_GPIO0, LOW);

cpq / wsserver.js

Created November 21, 2019 11:36

	const WebSocket = require('ws'); // npm install -g ws
	const server = new WebSocket.Server({port: 8000}, function() {
	console.log('WS server started');
	});
	server.on('connection', function connection(ws, req) {
	let i = 0;
	ws.on('message', function incoming(message) {
	console.log('received', message);
	});
	console.log('connected', req.connection.remoteAddress);