Sergey Lyubka cpq

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

cpq / slip.h

Created March 9, 2023 13:20

	// Copyright (c) Cesanta Software Limited
	// All rights reserved
	// SPDX-License-Identifier: MIT

	// Usage example (Arduino):
	// char buf[100];
	// struct slip slip = {.buf = buf, .size = sizeof(buf) - 1};
	// ...
	// unsigned char c = Serial.read();
	// size_t len = slip_recv(c, &slip);

cpq / queue2.c

Created February 15, 2023 09:26

	#include <sttdef.h>

	// Single producer, single consumer non-blocking queue
	//
	// Producer:
	// void *buf;
	// while (mg_queue_space(q, &buf, len) == 0) WAIT(); // Wait for free space
	// memcpy(buf, data, len); // Copy data to the queue
	// mg_queue_add(q, len); // Advance q->head
	//

cpq / queue1.c

Created February 14, 2023 16:18

	// Single producer, single consumer non-blocking queue
	//
	// Producer:
	// void *buf;
	// while (mg_queue_space(q, &buf, len) == 0) WAIT(); // Wait for free space
	// memcpy(buf, data, len); // Copy data to the queue
	// mg_queue_add(q, len); // Advance q->head
	//
	// Consumer:
	// void *buf;

cpq / preact-modal.html

Created April 20, 2022 15:18

cpq / ant1.ant

Created January 8, 2022 22:58

language yada yada

	// Blink LED
	2 = pin // pin = 2
	0 = on // on = 0
	pin 2 G // gpio.mode(pin, OUTPUT)
	1000 { !on = on pin on W } T

	'mqtt://broker.hivemq.com:1883' M = c
	c 'elk/rx' {
	'topic' $1 'message' $2 '{%Q:%Q, %Q:%Q}' c P // mqtt.publish
	} S // mqtt.subscribe(c, topic, func)

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

Last active January 5, 2026 10:23

	<!doctype html>
	<html>
	<head>
	<meta charset="utf-8" />
	<meta name="viewport" content="width=device-width, initial-scale=1.0" />
	<style>
	div {}
	:root { --bgColor: orange; }
	.panel { background: var(--bgColor); }
	</style>

	<!DOCTYPE html>
	<html lang="en">
	<head>
	<title>modal</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/5.1.0/css/bootstrap.min.css" />
	</head>
	<body></body>