taka-wang

// refer to http://stackoverflow.com/questions/8286806/go-programming-language-mutual-concurrent-execution
// https://gobyexample.com/mutexes
package main

import "sync"

var m sync.Mutex
var wg sync.WaitGroup

func routine1() {

taka-wang

#!/bin/sh
#
case "$1" in
	start )
		echo -n "Starting Node Services: "
		sleep 5
		cd /usr/bin/
		./core  > /tmp/core.log 2>&1 &
		sleep 2
		cd /root/node-red

taka-wang

package main

import (
	"fmt"
	"encoding/hex"
	"strconv"
	)

func main() {
	a := []byte{0xFF, 0xFA} // []byte{255, 250}

taka-wang

#
# Automatically generated file; DO NOT EDIT.
# OpenWrt Configuration
#
CONFIG_MODULES=y
CONFIG_HAVE_DOT_CONFIG=y
# CONFIG_TARGET_ppc44x is not set
# CONFIG_TARGET_realview is not set
# CONFIG_TARGET_arm64 is not set
# CONFIG_TARGET_sunxi is not set

taka-wang

// the setup function runs once when you press reset or power the board
void setup() {
    // initialize digital pin 13 as an output.
    pinMode(13, OUTPUT);
}

// the loop function runs over and over again forever
void loop() {
    digitalWrite(13, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(1000);              // wait for a second

taka-wang

 sudo apt-get install tightvncserver
 sudo nano /etc/init.d/tightvncserver
 sudo chmod 755 /etc/init.d/tightvncserver
 sudo update-rc.d tightvncserver defaults
 # run tightvncserver

taka-wang

import paho.mqtt.client as mqtt

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, rc):
    print("Connected with result code "+str(rc))
    # Subscribing in on_connect() means that if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe("hello/world")

# The callback for when a PUBLISH message is received from the server.

taka-wang

// Requires NodeJS and "noble" module: https://github.com/sandeepmistry/noble
// Based on: https://github.com/sandeepmistry/noble/issues/62

var noble = require('noble');
noble.on('stateChange', function(state) {
	if (state === 'poweredOn' ) {
		noble.startScanning([], false);
	} else {
		noble.stopScanning();
	}

taka-wang

#Install Debian on the Beaglebone Black, along with Go 1.4

##Ingredients:

1. Internet connected computer running Mac OS X (you may substitute some other Unix/Linux box---you'll need enough disk space to hold the Debian image (about 2GB), the ability to fetch content from the Internet, uncompress xz files, and the ability to write the image to a connected MicroSD card)

2. MicroSD card (> 4GB recommended)

taka-wang

var express = require('express');
var app = express();


app.get('/', function(req, res){
    console.log("get /");
    res.send('hello world');
});