How to test Mosquitto broker on Windows machine

Install Mosquito broker

https://mosquitto.org/download/

1. Install service easily by some click.
2. Check operation
Reference: http://www.steves-internet-guide.com/install-mosquitto-broker/

- open command prompt and check installed directory
cd C:\Program Files\mosquitto
mosquitto -h or mosquitto -v

- start service
mosquitto -p 1883

- check port 1883 is listening or not
netstat -a

- add system environment variables.
Add below string to the system environment path. It helps you call mosquito in the command line window.
;C:\Program Files\mosquitto

Example

Reference: https://www.win.tue.nl/~lrahman/iot_2016/tutorial/MQTT_2016.pdf
1. Open the first command windows
2. Start mosquitto by command
mosquitto -p 1883
3. Open the second command windows
4. Allow client subcribe the topic by command
mosquitto_sub -t 'test/topic' -v

This time, a client has the ability to handle the message from publisher.
5. Open the third command windows
6. Publish message by command
mosquitto_pub -t 'test/topic' -m “very_first_msg”

7. Look at the second command to see the message content which is sent by the publisher.
'test/topic' very_first_msg

Comments

[Git] Handle trailing space when patching with git

After complete coding one module in development branch. Next phase is merging. Obviously, you can merge source code automatically without no errors happen. However, life is not dream. Create a patch git diff HEAD > newTariff.patch Apply patch git apply newTariff.patch then problem happens Problem git apply newTariff.patch:106: trailing whitespace. patch does not apply Route cause: Nguyên nhân: Do trong source code có những dấu space thừa (ô vuông màu đỏ hình dưới) Some whitespaces is existed in your patch. (red area in below pictures) Fix Clean white space and patch again. Cách khắc phục Xóa những dấu space này đi và thực hiện patch lại Make up after complete coding. Find and clean whitespace before create patch file. Sửa sau khi code xong Kiểm tra sau khi code xong có lỗi này không git diff HEAD --check Prevent whitespace by manually when typing source code Sửa ngay khi đang code =>Bật chức năng hiển thị các dấu whitespace, hoặc remove trailing ...

How to test frame buffer in linux

The intended goal of this article is to provide the user with enough information so they can display an image onto a screen of their choosing. How to re-build frame buffer testing application. Base knowledge http://trac.gateworks.com/wiki/OpenEmbedded/Video_Out Frame buffer test application - rebuild fb-test-app step 1: Download soure code ( git installed on your machine and account in git-hub is required) https://github.com/prpplague/fb-test-app Command in git: git init git clone https://github.com/prpplague/fb-test-app.git step 2: Change makefile vi Makefile //open Makefile by vim editor :set nu //show line number replace from line 6 to line 12 by folow code: CC=arm-linux-gnueabi-gcc CFLAGS=-02 -Wall Save change command :wq step 3: Rebuid Type “make” command step 4: Copy execute file to target system by filezilla or something like that step 5: Remote target by root account, change mode of execute file (what copied from host) ...

[GTK] Example of using GtkBox with label and button

[1]Source code 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 #include <gtk/gtk.h> void on_window_closed (GtkWidget * window, gpointer data) { gtk_main_quit(); } static void destroy (GtkWidget * widget, gpointer data) { gtk_main_quit(); } static void button_clicked (GtkWidget * button, gpointer data) { g_print( "Button clicked \n " ); } int main ( int argc, char * argv[]) { GtkWidget * window, * label, * box, * button ; gtk_init( & argc, & argv); window = gtk_window_new(GTK_WINDOW_TOPLEVEL); gtk_window_set_title(GTK_WINDOW (window), "Test GTK" ); gtk_window_set_default_size (GTK_WINDOW (window), 500 , 200 ); #if 1 //Use gtk3: change 0->1, Use gtk2: keep it is 0 //Using gtk3 box = gtk_box_new(GTK_ORIENTATION_VERTICAL, 5 ); ...

Trumpy

Search This Blog