//#include "sys.h" //#include "usart.h" #include <string.h> #include "dianchuan.h" #include "app4g.h" #include "project_config.h" #include "cjson_middleware.h"  DianChuan_Frame DianChuanTxFrame = {0}; DianChuan_Frame DianChuanRxFrame = {0};  /* SOP     LEN     CMD     SESSION_ID     DATA SUM 1Byte   1Byte   1Byte   6Bytes          n       1Byte */ void DianChuan_ConstructTxCmdFrame(DianChuan_Frame *frame,u8 cmd,u8 *session_id,u8 *data,u8 datalen) {     u8 i =0;       if(frame == NULL)     {         return;     }     else         memset(frame,0,sizeof(DianChuan_Frame));      frame->sop = DIANCHUAN_TX_SOP;     frame->len = 0;     frame->cmd = cmd;     frame->len  ;     frame->sum = cmd;      if(s