利用Python简单实现环保212协议数据解码为字典结果【HJ212_2017协议的拆包解码】

1、直接上代码

#!/usr/bin/python3
#coding=utf-8
import time'''由数据字典 生成 HJ212_2017 协议字符串
'''
def encode(DIC_HJ212_2017):_data=''for key,value in DIC_HJ212_2017.items():if(key=='CP'):_data+='CP=&&'for cp_i,cp_item in DIC_HJ212_2017[key].items():                        for cp_key,cp_value in DIC_HJ212_2017[key][cp_i].items():_data+=cp_key+'='+str(cp_value)+','_data=_data[0:-1] _data+=';'    _data=_data[0:-1]                        _data+='&&'                        else:        _data+=key+'='+str(value)+';'_head='##'_length=len(_data)        STR_HJ212_2017=''STR_HJ212_2017+=_headSTR_HJ212_2017+=str(_length).zfill(4)STR_HJ212_2017+=_dataSTR_HJ212_2017+=str(crc16(_data)).zfill(4).upper();STR_HJ212_2017+='\r\n'return STR_HJ212_2017 '''由HJ212_2017 协议字符串数据 生成 字典
'''def decode(data):DIC_HJ212_2017={}DIC_HJ212_2017['HEAD']=data[0:2]DIC_HJ212_2017['LENGTH']=data[2:6]DIC_HJ212_2017['CRC']=data[-6:-2]DIC_HJ212_2017['DATA']={}DIC_HJ212_2017['DATA']['CP']={}    _d0=data[6:-6].split('&&')_d1=_d0[0][0:-4].split(';')    for _d2 in _d1:_d3=_d2.split('=')        DIC_HJ212_2017['DATA'][_d3[0]]=_d3[1]   _d4=_d0[1].split(';')for _d5 in _d4:_d6=_d5.split(',')for _d7 in _d6:_d8=_d7.split('=')DIC_HJ212_2017['DATA']['CP'][_d8[0]]=_d8[1]_data=data[6:-6]    if(int(DIC_HJ212_2017['LENGTH'])==len(_data)):print('数据长度验证通过')else:print('数据长度验证未通过')  if(DIC_HJ212_2017['CRC']==str(crc16(_data)).zfill(4).upper()):print('CRC校验通过')  else:print('CRC校验未通过') #print(DIC_HJ212_2017)  调试输出 结构为双层字典，类似JAVA对象  return DIC_HJ212_2017'''crc16效验'''
def crc16(text):data = bytearray(text, encoding='utf-8')crc = 0xffffdxs = 0xa001for i in range(len(data)):hibyte = crc >> 8crc = hibyte ^ data[i]for j in range(8):sbit = crc & 0x0001crc = crc >> 1if sbit == 1:crc ^= dxsreturn hex(crc)[2:]'''QN=年月日时分秒毫秒
'''
def get_time_stamp():timestamp=time.time()local_time = time.localtime(timestamp)data_head = time.strftime("%Y%m%d%H%M%S", local_time)data_secs = (timestamp - int(timestamp)) * 1000dt_ms = "%s%03d" % (data_head, data_secs)# print(dt_ms)return dt_ms#自我测试    
if __name__ == "__main__":data='##0131QN=20210730012315231;ST=31;CN=2011;PW=123456;MN=V130427GDSJ001;Flag=4;CP=&&DataTime=20210730012315;avoc01-Rtd=0.021,avoc01-Flag=N&&1A40\r\n'#print('时间='+decode(data)['DATA']['CP']['DataTime'])print('数据,avoc01-Rtd='+decode(data)['DATA']['CP']['avoc01-Rtd'])print('数据,avoc01-Flag='+decode(data)['DATA']['CP']['avoc01-Flag'])print('时间,DataTime='+decode(data)['DATA']['CP']['DataTime'])DIC_HJ212_2017={}            DIC_HJ212_2017['QN']=get_time_stamp()DIC_HJ212_2017['ST']='31'DIC_HJ212_2017['CN']='2011'DIC_HJ212_2017['PW']='123456'DIC_HJ212_2017['MN']='V130427GDSJ001'DIC_HJ212_2017['Flag']='4'DIC_HJ212_2017['CP']={}DIC_HJ212_2017['CP'][0]={}    DIC_HJ212_2017['CP'][0]['DataTime']=DIC_HJ212_2017['QN'][0:14]DIC_HJ212_2017['CP'][1]={}        DIC_HJ212_2017['CP'][1]['avoc01-Rtd']=0.021DIC_HJ212_2017['CP'][1]['avoc01-Flag']='N'print(encode(DIC_HJ212_2017))

2、运行调试

解码出的字典，结构类似JAVA对象，按结构取值即可