The basic parts of the BFSK transmitter are the preamble and the data input circuit. The preamble sequence is positioned in front of each packet of 122 bits for a total of 128 bits packet. The main purpose of the preamble is to facilitate the recepti

cmpp的开发的短信端口实例，可以参考该标准！,Development of SMS cmpp port example, can refer to the standard!