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hewalex2mqtt.py
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#!/usr/bin/python3
import serial
# change these data according to your needs
ser = serial.Serial('/dev/ttyUSB0', 38400)
mqttBroker ="127.0.0.1" # IP addres or DNS name of your MQTT broker
mqttPrefix="hewalex/" # MQTT Topic prefix
def twos_complement(hexstr,bits):
# Source: https://stackoverflow.com/questions/6727875/hex-string-to-signed-int-in-python-3-2
# Author: Mark Tolonen ( https://stackoverflow.com/users/235698/mark-tolonen )
value = int(hexstr,16)
if value & (1 << (bits-1)):
value -= 1 << bits
return value
ser.flushInput()
import paho.mqtt.client as mqtt
client = mqtt.Client("HEWALEX")
client.connect(mqttBroker)
from binascii import unhexlify
from binascii import hexlify
def HewalexRequest(requestID):
if requestID == 1:
print("Requesting bytes 100-149")
ser.write(unhexlify('6902018400000cf602000100408000326400bdb2')) # request 0x32 (50) registers from 0x64 (100)
if requestID == 2:
print("Requesting bytes 150-199")
ser.write(unhexlify('6902018400000cf602000100408000329600c811')) # request 0x32 (50) registers from 0x96 (150)
if requestID == 3:
print("Requesting bytes 200-249")
ser.write(unhexlify('6902018400000cf60200010040800032c800e5a1')) # request 0x32 (50) registers from 0xc8 (200)
def crc8_dvb_s2(crc, data):
for x in data:
crc ^= x
for _ in range(8):
if crc & 0x80:
crc = ((crc << 1) ^ 0xD5) % 256
else:
crc = (crc << 1) % 256
return crc
def crc16_ccitt(crc, data):
msb = crc >> 8
lsb = crc & 255
for x in data:
x = x ^ msb
x ^= (x >> 4)
msb = (lsb ^ (x >> 3) ^ (x << 4)) & 255
lsb = (x ^ (x << 5)) & 255
return (msb << 8) + lsb
def HewalexWaitForResponse(timeout):
print("Waiting for response.")
ser.timeout=int(timeout)
response=ser.read(70)
print("Response:")
respSize = len(response)
print(respSize)
## validate response length
if respSize == 0:
print("ERROR: No response received")
return
print(hexlify(bytearray(response)))
print(response[0])
if respSize == 70 and response[0]==0x69:
print("Packet Header")
print("-From: ",response[1])
print("-To: ",response[2])
print("-[3,4,5]: ",hexlify(response[3:6])) # ToDo: verify - response[3] always 0x84
print("-Payload: ",response[6]," Bytes")
print("-CRC: ",response[7]," CRC-8/DVB-S2 ")
## verify Packet Header CRC
if response[7] != crc8_dvb_s2(0, response[0:7]):
print("ERROR: Incorrect Header checksum")
return
## verify packet size based on packet length && payload length from header
if respSize != 8 + response[6]:
print("ERROR: Reported packet size does not match response length")
return
## verify payload data CRC
CRC = (response[-2] << 8) + response[-1]
if CRC != crc16_ccitt(0, response[8:8+response[6]-2]):
print("ERROR: Incorrect payload checksum")
return
print("Data header")
print("-From: ",response[8]) # Logical address?
print("-To: ",response[10]) # Logical address?
print("-FNC: ",response[12])
print("-[13]: ",response[13])
print("-Length: ",response[15]," Bytes")
print("-Start# ",response[16]," Byte[",response[16]," to ",int(response[16])+int(response[15]),"]")
fncID = int(response[12])
if fncID == 0x50:
startReg = int(response[16])
for iPacketPos in range(0,int(response[15])):
if (iPacketPos % 2 == 0):
iReg = iPacketPos+startReg
processed = 0
hexstr=hexlify(bytearray([response[19+iPacketPos],response[18+iPacketPos]]))
if iReg==120: #date
client.publish(mqttPrefix+"decoded/"+"controllerDate", "20"+str(response[18+iPacketPos])+"-"+str(response[18+iPacketPos+1])+"-"+str(response[18+iPacketPos+2]))
processed = 1
if iReg==124: #time
client.publish(mqttPrefix+"decoded/"+"controllerTime", str(response[18+iPacketPos]).zfill(2)+":"+str(response[18+iPacketPos+1]).zfill(2)+":"+str(response[18+iPacketPos+2]).zfill(2))
processed = 1
if iReg==128: #T1
client.publish(mqttPrefix+"decoded/T1",twos_complement(hexstr,16))
processed = 1
if iReg==130: #T2
client.publish(mqttPrefix+"decoded/T2",twos_complement(hexstr,16))
processed = 1
if iReg==132: #T3
client.publish(mqttPrefix+"decoded/T3",twos_complement(hexstr,16))
processed = 1
if iReg==134: #T4
client.publish(mqttPrefix+"decoded/T4",twos_complement(hexstr,16))
processed = 1
if iReg==136: #T5
client.publish(mqttPrefix+"decoded/T5",twos_complement(hexstr,16))
processed = 1
if iReg==138: #T6
client.publish(mqttPrefix+"decoded/T6",twos_complement(hexstr,16))
processed = 1
if iReg==144:
client.publish(mqttPrefix+"decoded/SolarPower",int(hexstr,16))
processed = 1
if iReg==148:
client.publish(mqttPrefix+"decoded/Reg148",twos_complement(hexstr,16))
processed = 1
if iReg==150:
client.publish(mqttPrefix+"decoded/CollectorPumpON",int(hexstr,16))
processed = 1
if iReg==152:
client.publish(mqttPrefix+"decoded/Flow",twos_complement(hexstr,16)/10)
processed = 1
if iReg==154:
client.publish(mqttPrefix+"decoded/Reg154",twos_complement(hexstr,16))
processed = 1
if iReg==156:
client.publish(mqttPrefix+"decoded/Reg156",twos_complement(hexstr,16))
processed = 1
if iReg==166:
client.publish(mqttPrefix+"decoded/TotalEnergy",int(hexstr,16)/10)
processed = 1
# only unprocessed data goes to /raw topic
if processed == 0:
client.publish(mqttPrefix+"raw/"+str(iReg),hexstr)
#client.publish(mqttPrefix+"raw/"+str(iReg)+'/val',twos_complement(hexstr,16))
HewalexRequest(1)
HewalexWaitForResponse(1)
HewalexRequest(2)
HewalexWaitForResponse(1)
HewalexRequest(3)
HewalexWaitForResponse(1)
def menuPrint():
print(" Make a choice:")
print(" [1] Request registers 100-149")
print(" [2] Request registers 150-199")
print(" [3] Request registers 200-249")
print(" [4] Exit")
print("==============================")
#menuPrint()
#choice=input("Enter number {1..4}: ")
#if choice.isnumeric():
# if int(choice) > 0 and int(choice) < 4:
# HewalexRequest(int(choice))
# HewalexWaitForResponse(5)