At present, the wireless communication technology of vending machine is mostly based on GSM short message and 4 G network.But GSM‘s low communication rate and 4 G network’s high algorithm complexity are obstacles to the wide spread of Internet of things vending machines.To solve above problems, a vending machine system with STM32 as the controller was designed. The low power chip ESP8266 was used for wireless data transmission, so that WiFi transmission replaced the traditional wireless transmission method. The experimental results showed tha...