模块每次发送最大自己数
该文档介绍了AM900E模块每次发送最大字节数的测试过程，每次发送最大字节数为5K,并且分四次发送，相关实例如下：
AT指令测试过程如下:
```
AT+CSQ
+CSQ: 27,99
OK
AT+CGATT=1
+CGATT:1
OK
AT+CGDCONT=1,"IP","cmnet"
OK
AT+CGACT=1,1
OK
AT+CIPSTART="TCP","101.200.35.208",8080
OK
CONNECT OK
OK
AT+CIPSEND=5120 //发送最大字节数5K
> 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121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212121212
OK
OK
OK
OK
```