Simply put, it is the specific application of the Internet of Things in industrial control.
Question 2: What is 2:SSL/TLS?
SSL (Secure Sockets Layer Secure Sockets Layer) and its successor, Transport Layer Security (TLS), are a security protocol that provides security and data integrity for network communication. TLS and SSL encrypt network connections at the transport layer. Most Internet logins use SSL/TLS. You can go to Netease mailbox http://WWW. 126. And in the lower right corner, you can see the sign "Login with SSL".
Question 3: What is 3:MQTT?
MQTT (Message Queuing Telemetry Transport) is an instant messaging protocol developed by IBM, which may become an important part of the Internet of Things. This protocol supports all platforms. Compared with the traditional industrial communication protocol, MQTT protocol has two characteristics: it adopts publish/subscribe message mode to provide one-to-many message publishing; It can be used in combination with SSL/TLS encryption to ensure the security of message transmission.
Question 4: What is 4:JSON?
JSON (JavaScript Object Notation, JSON) is a lightweight data exchange format, and its Chinese name is JSON for short. JSON is a string representation of a JS object. It uses text to represent the information of JS object, which is essentially a string. The following is a format of Baidu Tiangong.
{
"request id ":" {request Id}",
"method": "put"
" path ":"/v 1/my device/metadata "，
"Text": {
"Metadata": {
“memory free”:“32MB”，
Light: Green
},
[Shape reversal]: 5
}
}
The above format is Baidu Tiangong. What is Baidu Tiangong? Official introduction: Tiangong is a "one-stop, fully hosted" intelligent Internet of Things platform based on Baidu cloud and integrating Baidu big data and artificial intelligence technology. Provide a series of core products and services of the Internet of Things, such as access, analysis, management, rule engine, time series database, machine learning, MapReduce, etc. To help developers quickly realize seamless connection from devices to servers and build them efficiently.
Question 5: What is a gateway?
Generally speaking, the gateway is embedded software and hardware, with communication interfaces such as Ethernet, RS485, GPRS, 3G, 4G, etc., which realizes the protocol conversion function and converts the PLC protocol into MQTT protocol, thus realizing the transmission of device data to the cloud platform. To borrow an advertising word, "the gateway does not generate data, but is just a porter of data".
At present, Mestec Gateway has been connected to six platforms (ZKYC, NJCR, SHRJ, BJHT, BJPO and HXWL) and will be connected to two platforms (Huawei MES and SHZY). It is estimated that more than 10 cloud platform software will be accessed by the end of April 38+07 in 2065, and communication access with ThingWorx will be completed within this year. Huawei MES adopts MQTT protocol to realize data acquisition and control, which is worth learning from MES.
Off topic:
MQTT has become the preferred cloud communication protocol for domestic industrial Internet of Things, especially in the remote operation and maintenance system of large equipment manufacturers, MQTT+SSL/TLS will become the standard. On top of MQTT protocol, JSON format will become a must. Because most of the cloud platform software is developed in JAVA, the MQTT protocol in JSON format will be more popular with cloud platform developers. However, for traditional industrial automation personnel, MQTT protocol is still relatively difficult to contact, and it is much more common to contact Modbus and OPC.