Way of working
1. Active serial device networking:
Active serial device networking refers to the way in which the device initiates a connection and performs data interaction (uploading or downloading) with the background server. A typical active device, such as a wireless POS machine, begins to connect to the backend server and uploads transaction data after each swipe transaction is completed. The topology of the PUSH serial device networking is shown in the right figure. The backend server is used as the TCP server. The device accesses the network through the wireless AP/router and acts as the TCP client.
2. Passive serial device networking:
Passive serial device networking refers to the fact that all devices in the system are always in a passive waiting state, and only the background server initiates a connection with the device and requests or transmits data. Typical applications, such as some wireless sensor networks, each sensor terminal is always collecting data in real time, but the collected data is not immediately uploaded, but temporarily stored in the device. The background server periodically connects to the device periodically and requests to upload or download data.
At this point, the backend server actually acts as the TCP Client, and the device acts as the main feature of the TCP Server 2.4GHz, IEEE 802.11b/g internal PCB antenna, optional external antenna supports AP-based network/Peer-to-Peer network Ad-Hoc (IBSS)) / Virtual AP mode, IPHONE/IPAD/Android devices can also connect directly to support 802.11i encryption without AP/router: WEP-64/128, TKIP (WPA-PSK) and AES (WPA2- PSK) MCU built-in TCP/IP protocol stack 3 UART serial interfaces (1 channel supports DMA mode, full-function serial port, baud rate supports up to 921.6Kbps) SPI interface, I2S/PCM interface Digital Video port up to 24 GPIO ports (Some GPIOs will be multiplexed with the above interfaces) Full-featured TCP/IP protocol stack, TCP/IP transmission bandwidth up to 10Mbps or more Supports three WiFi energy-saving modes with timed automatic wake-up function