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Copy pathStecaGrid3600_mqtt.py
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StecaGrid3600_mqtt.py
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#!/usr/bin/env python3
#
# Python service to serve MQTT topics based on RS485 readings from a StecaGrid 3600 inveter
# Uses serial connection to request inverter meter data every few seconds
# publishes the values to a (sub) topic via MQTT to a broker
import yaml # pip3 install pyyaml
import paho.mqtt.client as mqtt # pip3 install paho-mqtt
import argparse
import sys
import re
import struct
import serial # pip3 install pyserial
import datetime
import time
from ctypes import c_ushort
DEBUG = False
config_file = 'config.yaml'
sys.stdout.reconfigure(encoding='latin1')
SERIAL_DEVICE = "/dev/ttyS0"
SERIAL_BYTES = serial.EIGHTBITS
SERIAL_PARITY = serial.PARITY_NONE
SERIAL_SBIT = serial.STOPBITS_ONE
SERIAL_BAUDRATE = 38400
SERIAL_TIMEOUT = 1
# Recorded packets of StecaGrid SEM (id #123/0x7b) talking to StecaGrid 3600 (id #1) for replay
SG_NOMINAL_POWER = bytes.fromhex("02 01 00 10 01 7b b5 40 03 00 01 1d 72 30 95 03")
SG_PANEL_POWER = bytes.fromhex("02 01 00 10 01 7b b5 40 03 00 01 22 77 12 ee 03")
SG_PANEL_VOLTAGE = bytes.fromhex("02 01 00 10 01 7b b5 40 03 00 01 23 78 78 e4 03")
SG_PANEL_CURRENT = bytes.fromhex("02 01 00 10 01 7b b5 40 03 00 01 24 79 a0 b6 03")
SG_VERSIONS = bytes.fromhex("02 01 00 0c 01 7b c6 20 03 79 8c 03")
SG_SERIAL = bytes.fromhex("02 01 00 10 01 7b b5 64 03 00 01 09 5e 85 6e 03")
SG_TIME = bytes.fromhex("02 01 00 10 01 7b b5 64 03 00 01 05 5a 3a 44 03")
SG_DAILY_YIELD = bytes.fromhex("02 01 00 10 01 7b b5 40 03 00 01 3c 91 e1 c9 03")
SG_TOTAL_YIELD = bytes.fromhex("02 01 00 10 01 7b b5 64 03 00 01 f1 46 cc 79 03")
SG_AC_POWER = bytes.fromhex("02 01 00 10 01 7b b5 40 03 00 01 29 7e 98 5b 03")
ID_AC_POWER = 0x29
# ELECTRICITY_EXPORTED_TOTAL = :2.8.0 # Total exported energy register (P-)
# CURRENT_ELECTRICITY_DELIVERY = :2.7.0
# Q3D_EQUIPMENT_SERIALNUMBER = :96.1.255 # Device Serialnumber
mapping = {
"ELECTRICITY_EXPORTED_TOTAL": SG_TOTAL_YIELD, # :2.8.0 # Total exported energy register (P-)
"CURRENT_ELECTRICITY_DELIVERY": SG_AC_POWER, # :2.7.0
"Q3D_EQUIPMENT_SERIALNUMBER": SG_SERIAL, # :96.1.255 # Device Serialnumber
"CURRENT_PANEL_POWER": SG_PANEL_POWER,
"CURRENT_PANEL_VOLTAGE": SG_PANEL_VOLTAGE,
"CURRENT_PANEL_CURRENT": SG_PANEL_CURRENT,
}
def decode_stecaFloat_a(ac_bytes):
if ac_bytes[0] == 0x0B:
unit = "W"
elif ac_bytes[0] == 0x07:
unit = "A"
elif ac_bytes[0] == 0x05:
unit = "V"
elif ac_bytes[0] == 0x0D:
unit = "Hz"
elif ac_bytes[0] == 0x09:
unit = "Wh"
elif ac_bytes[0] == 0x00:
unit = "NUL"
else:
unit = f'0x{ac_bytes[0]:02x}'
iacpower = ((ac_bytes[3] << 8 | ac_bytes[1]) << 8 | ac_bytes[2]) << 7 # formula to float - conversion according to Steca
facpower, = struct.unpack('f', struct.pack('I', iacpower))
if DEBUG:
print("# i: 0x%0X" % iacpower,"=", str(iacpower))
print("# f:", facpower)
return [facpower, unit]
def decode_stecaFloat(in_bytes):
results = decode_stecaFloat_a(in_bytes)
return f"{results[0]:0.2f} {results[1]}"
def decode_TotalYield_a(ba):
#five byte array,
bits = ba[3] << 24 | ba[2] << 16 | ba[1] << 8 | ba[0]
ieee , = struct.unpack('f', struct.pack('I', bits))
return [ieee, "Wh"]
def decode_version(b):
o = b'SSXSNSSNSSNSSNSSNSSNSSNSSNSSNSSNSSNSSNSSNSSNSSNSSNSSNSSSSSSSSSSSS'
so = []
aos = []
for i in range(len(b)):
if o[len(aos)] == 83 and b[i] == 0:
aos.append(''.join(so))
so = []
elif o[len(aos)] == 78 and len(so)>6:
aos.append('.'.join(so[2:5]))
so = []
elif o[len(aos)] == 88 and len(so)>1:
aos.append('')
so = []
if o[len(aos)] == 83:
so.append(chr(b[i]))
elif o[len(aos)] == 78 or o[len(aos)] == 88:
so.append(str(b[i]))
s = ""
for i in range(len(aos)):
s += aos[i]
if i<3 or (i-4)%3 == 1:
s += '\n'
else:
s += '\t'
return s
def process_telegram(t):
formatted_hex_bytes = ''
printable = ''
for byte in t:
hex_byte = f'{byte:02x}'
formatted_hex_bytes += f'{hex_byte:>2} '
if not 32 <= byte <= 126:
printable += '.'
else:
printable += chr(byte)
return formatted_hex_bytes +"\r\n"+ printable +"\r\n"
def format_hex_bytes(b):
formatted_hex_bytes = ''
for byte in b:
hex_byte = f'{byte:02x}'
formatted_hex_bytes += f'{hex_byte:>2} '
return formatted_hex_bytes.strip()
def format_printable(b):
printable = ''
for byte in b:
if not 32 <= byte <= 126:
printable += '.'
else:
printable += chr(byte)
return printable
def is_one_full_telegram(t):
if not t or len(t)<1:
return False
if t[0] != 2:
#print("not starting w/ 0x02")
return False
if t[len(t)-1] != 3:
#print("not ending w/ 0x03")
return False
if len(t) != (t[2] << 8 | t[3]):
#print("wrong length",len(t), "!=", (t[2] << 8 | t[3]))
return False
return True
def process_steca485(t):
"""
parse telegram from StecaGrid RS485 protocol
returns an array
msg group
msg topic
clear text topic
values
or payload has hex string
:param str telegram:
"""
if is_one_full_telegram(t):
results = [t[4], t[5], t[7], t[11]]
total_length = (t[2] << 8 | t[3])
if DEBUG:
print("#",format_hex_bytes(t))
print("# dgram:","",end="")
# print("# ",t[4:-1])
# print("start:",t[0]," ",end="")
print("to:",t[4]," ",end="")
print("from:",t[5]," ",end="")
print("len:",total_length," ",end="")
print(f"crc1: {t[6]:02x}"," ",end="")
print(f"crc2: {t[-3]:02x}{t[-2]:02x}"," ",end="")
print() # print("stop:",t[-1])
# Payload started 7
print("# payload:", format_hex_bytes(t[7:-3]) ,"",end="")
print(" ", format_printable(t[7:-3]))
if t[7] == 0x40: # 64: Requests
topic=""
if t[11] == 0x1d: # 29:
topic = " (Nominal Power)"
elif t[11] == 0x22: # 34:
topic = " (Panel Power)"
elif t[11] == 0x23: # 35:
topic = " (Panel Voltage)"
elif t[11] == 0x24: # 36:
topic = " (Panel Current)"
elif t[11] == 0x29: # 41:
topic = " (ACPower)"
elif t[11] == 0x3c: # 60:
topic = " (Daily Yield)"
if DEBUG:
print(f"# RequestA for 0x{t[11]:02x}{topic} from {t[4]}")
elif t[7] == 0x41: # 65: Responses
if t[8] == 0x00:
len = (t[9] << 8 | t[10])
if DEBUG:
print(f"# ReponseA for 0x{t[11]:02x} from {t[4]} len={len}")
if t[11] == 0x51: # 81: Label Value Value Value Value byte Label Value Value Value Value byte
i_labelA = 15
i_valA1 = i_labelA + (t[i_labelA-2] << 8 | t[i_labelA-1])
i_valA2 = i_valA1+4
i_valA3 = i_valA2+4
i_valA4 = i_valA3+4
#print(i_labelA,t[i_labelA-2],t[i_labelA-1],i_valA1,i_valA2,i_valA3,i_valA4)
i_labelB = i_valA4+4+1+2
i_valB1 = i_labelB + (t[i_labelB-2] << 8 | t[i_labelB-1])
i_valB2 = i_valB1+4
i_valB3 = i_valB2+4
i_valB4 = i_valB3+4
#print(i_labelB,t[i_labelB-2],t[i_labelB-1],i_valB1,i_valB2,i_valB3,i_valB4)
#label = t[15:15+t[14]]
if DEBUG:
print("#", str(t[i_labelA:i_valA1]),
decode_stecaFloat(t[i_valA1:i_valA2]),
decode_stecaFloat(t[i_valA2:i_valA3]),
decode_stecaFloat(t[i_valA3:i_valA4]),
decode_stecaFloat(t[i_valA4:i_valA4+4]))
print("#", str(t[i_labelB:i_valB1]),
decode_stecaFloat(t[i_valB1:i_valB2]),
decode_stecaFloat(t[i_valB2:i_valB3]),
decode_stecaFloat(t[i_valB3:i_valB4]),
decode_stecaFloat(t[i_valB4:i_valB4+4]))
elif t[11] == 0x3c: # 60:
label = "Daily Yield"
val = decode_stecaFloat_a(t[12:16])
results += [label, val]
if DEBUG:
print("#", label, val[0], val[1])
else:
label = t[15:15+t[14]].decode("ascii")
val = decode_stecaFloat_a(t[15+t[14]:15+t[14]+5])
results += [label, val]
if DEBUG:
print("#", label, val[0], val[1])
elif t[7] == 0x64: # 100: Requests
if DEBUG:
print(f"# RequestB for 0x{t[11]:02x} from {t[4]}")
elif t[7] == 0x65: # 101: Responses
if DEBUG:
print(f"# ReponseB for 0x{t[11]:02x} from {t[4]}")
if t[11] == 0xF1: # 241: Total Yield
results += ["Total Yield", decode_TotalYield_a(t[12:16])]
if DEBUG:
print("# (",format_hex_bytes(t[12:17]),")")
print("#", decode_TotalYield_a(t[12:16]))
elif t[11] == 0x05: # 5: Time
time = datetime.datetime(2000+t[12], t[13], t[14], t[15], t[16], t[17]) # ignoring final 3 byte for now. TZ, millis, ...?
results += ["Time", [time,""]]
if DEBUG:
print(f"# {time} (",format_hex_bytes(t[12:21]),")")
elif t[11] == 0x08: # 8: ???
results += ["???", [format_hex_bytes(t[12:17]),""]]
if DEBUG:
print("# (",format_hex_bytes(t[12:17]),")")
print("#", decode_stecaFloat(t[12:16]))
elif t[11] == 0x09: # 9: Serial
results += ["Serial Number", [t[12:-4].decode("ascii"),""]]
if DEBUG:
print("# (",format_hex_bytes(t[12:17]),")")
print("#", decode_stecaFloat(t[12:16]))
else:
results += ["???", [format_hex_bytes(t[12:17]),""]]
elif t[7] == 0x21: # 33: Versions
if t[8] == 0x00:
len = (t[9] << 8 | t[10])
results += ["???", [decode_version(t[11:-3]),""]]
if DEBUG:
print("# ReponseC for", t[11], "from", t[4], "len=",len)
return results
else:
if DEBUG:
print("# NOT a single full Steca485 Telegram")
def getStecaGridResult(req):
if DEBUG:
print("ser write: "+process_telegram(req))
results = process_steca485(req)
print(results)
steca.write(req)
in_data = steca.read(size=1024)
results = process_steca485(in_data)
if DEBUG:
print(results)
if results and results[5][1] != "NUL":
return results[5]
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Feed MQTT based on RS485 from StecaGrid3600')
parser.add_argument('-v', '--verbose', action='store_true', help='Enable verbose output')
parser.add_argument('-c', '--config', help='Load config from (default '+config_file+')')
args = parser.parse_args()
DEBUG = args.verbose
if args.config:
config_file = args.config
with open(config_file) as file:
config = yaml.safe_load(file)
if config:
if DEBUG:
print(config)
ser = SERIAL_DEVICE
if config['serial_device']:
ser = config['serial_device']
steca = serial.Serial(baudrate=SERIAL_BAUDRATE, port=ser, timeout=SERIAL_TIMEOUT, parity=SERIAL_PARITY, stopbits=SERIAL_SBIT, bytesize=SERIAL_BYTES, xonxoff=0, rtscts=0)
if DEBUG:
print(steca.get_settings())
ac_power = getStecaGridResult(SG_AC_POWER)
if ac_power:
if DEBUG:
print(ac_power)
else:
ac_power = 0
if DEBUG:
print ("Current ACPower:",ac_power)
mqtt_client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)
if 'mqtt_username' in config:
mqtt_client.username_pw_set(config['mqtt_username'], password=config['mqtt_password'])
mqtt_client.reconnect_delay_set(min_delay=1, max_delay=120)
try:
mqtt_client.connect(config['mqtt_broker_address'])
except Exception as e:
print("Can't connect to MQTT Broker (", config['mqtt_broker_address'] ,"):", e)
steca.close()
exit()
mqtt_client.loop_start()
if 'client' in config:
if config['client'] == 'serial':
try:
while True:
for n in config['values_of_interest']:
if DEBUG:
print("OBIS:", n)
if n in mapping:
if DEBUG:
print("StecaMsg:", mapping[n])
v = getStecaGridResult(mapping[n])
if DEBUG:
print("StecaResult:", v)
if not v or len(v) < 2 or v[1] == "NUL" or v[0] == "":
pl = 0
else:
pl = v[0]
if not ( n == 'ELECTRICITY_EXPORTED_TOTAL' and pl == 0 ) :
published = mqtt_client.publish(config['topic'] + '/' + n, payload=float(pl), qos=0)
if DEBUG:
print("MQTT: ", config['topic'] + '/' + n,float(pl), " > ", published)
published.wait_for_publish()
time.sleep(1)
except KeyboardInterrupt:
print()
finally:
mqtt_client.loop_stop()
steca.close()