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preface The common kettle generally has boiling and heat preservation functions. On this basis, this case uses the graffiti BLE SDK and BLE module to realize the remote control of the kettle, including the functions of heat preservation temperature setting, water quality mode selection, reservation of water boiling, etc. in addition, it also a ...

backgroundThe timing scenario of the Internet of things is one of the hottest directions at present. Massive time series data such as vehicle trajectory data, vehicle status monitoring data and sensor real-time monitoring data need to be stored in the database. In general, the following requirements exist in such scenariosData high write, low r ...

explain netstat command is a very useful tool for monitoring TCP/IP network. It can display routing table, actual network connection and status information of each network interface device, as well as statistical data related to IP, TCP, UDP and ICMP protocols. It is generally used to check the network connection of each port of the machine an ...

Background introductionUsing the JITR function, you can quickly register the device certificate and launch the device. However, the way to configure the relevant Amazon Lambda functions is relatively complex. Use the instant deployment described in this article (JITP) function can simplify the steps of Amazon IoT rules and Amazon Lambda functio ...

stay C++ In, there is a special member function with the same name as the class name and no return value. It does not need to be explicitly called by the user (nor can the user), but is automatically executed when the object is created. This special member function is the Constructor. In< Access rights of C + + class members and class encap ...

First met LoRa In short, LoRa is a low-power remote wireless communication technology. It is a wireless data transmission module developed based on SX1276/1278 chip of Semtech company. This chip has small integration scale and high efficiency, so that LoRa module has high receiving sensitivity. So what are its advantages over our commonly ...

Article catalog Article catalog preface 2, Composition 1. Basic elements 3, JSON parsing summary reference resources preface Recent internship, smart home related, need to be developed with esp8266. I haven't studied 8266 before, b found on the station The related tutorials of [Tai Chi maker esp8266] are much s ...

Based on node JS build a simple MQTT server, and the mobile phone connects to the computer through the hotspot to realize the MQTT server test Server construction First, build the node JS environment. Configure the MQTT server. There are many online tutorials. You can refer to this blog for configuration Node.js configuration. Server mqtt j ...

STM32 library function development series article directory Part I: program design and implementation of STM32F103ZET6 single chip microcomputer dual serial port mutual transmission Part II: the simplest DIY Bluetooth smart car design scheme based on STM32 single chip microcomputer preface The simplest original core technology of t ...

brief introduction The data type is different from the variable type. The variable type is based on the data type. We usually create variables using the variable type. Generally speaking, custom data types are structures. Mainly refer to open62541's own example. target Add custom structure types to the Server as data types and use them. ...