The editor explains 10 basic knowledge of serial port wifi for you:

Question 1: What is a serial port wifi module?

Answer: In fact, it can be understood as a converter, which converts the serial port signal of the microcontroller into a wireless WiFi signal, 

also called serial port to WiFi.

Question 2: How does the serial port WIFI module work?

Answer: Its working principle is as follows: Network sends - TCP data <-> module <-> serial port data <-> MCU receives. The same is true in 

reverse, the WIFI module is just a transmission channel.

Question 3 : How many working modes does the serial port wifi module have?

Answer: There are two working modes of the serial port wifi module, one is AT mode and the other is transparent transmission mode. AT 

mode generally uses the AT instruction set to operate, which is an AT instruction. The transparent transmission mode is the default mode of 

the wifi module. No matter what data is thrown to the wifi module, the WIFI module does not process it and is only responsible for forwarding it.

Question 4 : What are the working modes of the serial port wifi module?

Answer: The serial port wifi module has two working modes, namely AP and STA. AP is a hotspot, which means that it can radiate a wireless 

wifi network as an AP mode. STA is the station mode, client mode.

Question 5: What is the difference between TCP protocol and UDP protocol in network communication?

Answer: UDP protocol is the broadcast protocol we are familiar with. It is an unreliable communication protocol and is generally used to find 

the IP address of a certain device in network communication. TCP protocol is a reliable protocol. A three-way handshake must be established 

during the communication process. The TCP connection is initiated by the client during the communication process.

Question 6 : How to switch between command mode and transparent mode?

Answer: Switch the transparent transmission mode to command mode, send +++ (three and only three +) through the serial port, and the wifi 

module returns +ok, indicating that the wifi module has entered AT mode. Switch the AT mode to transparent transmission mode by sending AT+Z.

Question 7 : Can the serial port wifi module be remotely controlled?

Answer: The serial port wifi module can be remotely controlled, but it must be based on a server. However, the external network server needs to 

be able to find the IP address of the WIFI module