SIM900A的EAT开发，文档中的源码实现功能比较多。Adc，audio play,csd,customerATCommand,DTMF,fcm,flash,gpio,gpio interrupt,http,i2c,keypad,pwm,serialPortStatus,SIM_MUX,sms,socket,spi,spienhance,system,TCP,timer,update,urc-SIM900A EAT development, in the document source mor

车联网监控源码，STM32读取OBD数据（TDA61），集成GPS与GC65模块，通过HTTP与短信方式通信-internet of car OBD stm32 gps gprs gc65 SMS