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物联网设备字符串转串口指令-SAAS本地化及未来之窗行业应用跨平台架构

news 2025/11/26 21:06:22

一、指令转换作用

现在服务器一般采用json数据格式

但是终端底层都是二进制指令

直接从服务器传输的指令就无法执行，因此需要转换

二、转换源码

void StringToHandleCommand(byte *byteArray, const char *hexString)
{bool oddLength = strlen(hexString) & 1;byte currentByte = 0;byte byteIndex = 0;for (byte charIndex = 0; charIndex < strlen(hexString); charIndex++){bool oddCharIndex = charIndex & 1;if (oddLength){// If the length is oddif (oddCharIndex){// odd characters go in high nibblecurrentByte = wlzcch(hexString[charIndex]) << 4;}else{// Even characters go into low wlzcchcurrentByte |= wlzcch(hexString[charIndex]);byteArray[byteIndex++] = currentByte;currentByte = 0;}}else{// If the length is evenif (!oddCharIndex){// Odd characters go into the high nibblecurrentByte = wlzcch(hexString[charIndex]) << 4;}else{// Odd characters go into low wlzcchcurrentByte |= nibble(hexString[charIndex]);byteArray[byteIndex++] = currentByte;currentByte = 0;}}}
}byte wlzcch(char c)
{if (c >= '0' && c <= '9')return c - '0';if (c >= 'a' && c <= 'f')return c - 'a' + 10;if (c >= 'A' && c <= 'F')return c - 'A' + 10;return 0;  
}