Support GPRS and wifi two main technology, seamless switch in these two.
Based on ESP8266 (or 8285) wifi IC.
Serial UART communication from MCU to A20, or camera data from A2; A20 data transmission via GPRS or wifi to user.
GPRS and Wifi can power alone, and work alone.
Support four working mode, GPRS mode, wifi mode, both mode, wifi control GPRS and camera mode. use esp8266/8285 secondary uart port, this need develop your own program.
Semi-hole technology, through the standard SMT equipment to achieve the rapid production module for customers with high reliability of the connection, especially for automation, large-scale, low-cost modern production methods.