1. Introduction This article mainly introduces how Node-Red uses the plug-in node-red-contrib-opc-da and the plug-in node-red-contrib-opcda-client to communicate with the OPC DA server, and uses KEPServer to simulate the server. Environment setup This environment setup requires two machines, in the same LAN: Server Function: Simulate OPC DA server Operating system: Windows 7 Professional Client computer […]
Tag: communicate
Use SSH to communicate between windows and linux
Introduction SSH is a secure network protocol designed to allow secure data transfer between clients and servers. The core idea of SSH is to use a combination of public key encryption technology and shared key encryption technology to establish a secure connection between the client and the server. When a client initiates a connection request, […]
Using mavros to communicate between pixhawk and raspberry pi 4B
Environment Windows 11 pixhawk2.4.8 Raspberry Pi 4B QGroundControl 4.2.8 Mission Planner 1.3.80 ardupilot ubuntu 20.04.2 ros noetic (The software and hardware versions used by me are for reference only) Steps Install firmware on pixhawk (I use arduSub 4.2.0) Install ubuntu20 on Raspberry Pi Raspberry Pi enables hardware serial communication Install ros on raspberry pi Install […]
Action two nodes in Ros2 actively communicate in two directions
Plan implementation: Process 1: The robot sends an audio piece to the server Process 2: After the server processes the audio, it actively sends a playback request to the robot. Process 3: After the robot completes playback, it sends a response to the server Process 4: Then the server returns the end command to the […]
ESP8266 based on stm32 control communicates in routing mode
The ideas and instructions here are the same as those in 51. The ideas are the same. The only difference is that the interrupt handler is different. This is a detail issue. At the end, I will compare the small episodes where 51 and 32 are processed in the interrupt program. I have not paid […]
ESP8266 based on stm32 control communicates in device mode
1. Instructions to be used in the article Command Function AT + UART=115200,8,1,0,0 The previous 51 communication was 9600, the 321 here uses 115200, the baud rate needs to be changed AT + CWMODE=X X is 1 for station (device) mode, X is 2 for AP (routing) mode, and X is 3. Dual-mode mode (the […]
ESP32 communicates with mobile phone via Bluetooth (uniapp)
I’ve been searching online for a long time but can’t find one that can be used directly. It’s hard for a novice! ! ! The main thing is to send and receive data, and the information on the Internet cannot be used (Hongmeng system). Now it has been solved. I hope novices will make less […]
Best way to communicate between Fragments
In Android applications, fragments are components used to build flexible and reusable user interfaces. However, when multiple fragments are used in an application, communication between them becomes very important. This article will introduce how to implement communication between fragments and between fragments and host activities in Android applications. Use ViewModel for communication ViewModel is an […]
HAL library_STM32 communicates with Tao Jingchi T1 series serial port screen
1. Experimental purpose Tao Jingchi serial screen design software, Kei and STM32CubeMX software are used in combination with hardware to complete simple communication between the serial screen and the microcontroller. 2. Hardware connection 32 microcontroller and serial port screen connection Connect the serial port screen to the power board 3. Use USART HMI software to […]
Openmv identifies traffic lights and communicates with STM32
Openmv recognizes traffic lights and communicates with STM32 (multi-color recognition) Preface working principle Pin connection (here I use serial port three of openmv and serial port one of STM32) Openmv code part STM32 code part Serial port initialization configuration function main function Write a receiving function Main function content Foreword It is very common for […]