question

so at the moment I have the following I've subscribed to... by just digging around and asking a bit, given suggestions by a friend.

Grid supply (assuming this is measure by ET112): N/xxxxx/system/0/Ac/Grid/L1/Power

Output to Rail #3 (Essentials:N/xxxxx/system/0/Ac/ConsumptionOnOutput/L1/Power

Array #1 Power output : N/xxxxx/solarcharger/258/Yield/Power

Array #1 Current output : N/xxxxx/solarcharger/258/Pv/I

Array #1 Voltage output : N/xxxxx/solarcharger/258/Pv/V

Array #2 Power output : N/xxxxx/solarcharger/260/Yield/Power

Array #2 Current output : N/xxxxx/solarcharger/260/Pv/I

Array #2 Voltage output : N/xxxxx/solarcharger/260/Pv/V

Array Total Power Output : N/xxxxx/system/0/Dc/Pv/Power

Array Total Current Output : N/xxxxx/system/0/Dc/Pv/Current

Array Total Voltage :

(The following come directly from the Pylontech via the onboard BMS interface I understand)

Pylontech Battery Array input/output Current : N/xxxxx/system/0/Dc/Battery/Current

Pylontech Battery Array input/output Power : N/xxxxx/system/0/Dc/Battery/Power

Pylontech Battery Array SoC : N/xxxxx/system/0/Dc/Battery/Soc

Pylontech Battery Array Voltage : N/xxxxx/system/0/Dc/Battery/Voltage

Looking for

How much the Inverter is pushing out onto Rail #2, this with what the ET112 is allowing in I would think should be my Rail #2 usage.

Total Usage I would guess is :

N/xxxxx/system/0/Ac/Grid/L1/Power + N/xxxxx/system/0/Ac/ConsumptionOnOutput/L1/Power + What ever is pushed out onto Rail #2.

Power coming directly from the PV Array I take as N/xxxxx/system/0/Dc/Pv/Power, then assume this plus N/xxxxx/system/0/Dc/Battery/Power is the combined inverted value, ie I'm pulling a bit from the battery, a little bit from PV and some from the grid...

G

There is a very nice open source PC tool called MQTT.fx that has the ability to show you all topics that are available from a broker (topic scan). This is great for finding useful topics.

Does that work for you ?

All I did was turning on the MQTT Service on my Venus.

Then I started my MQTT.fx and connected to the Venus MQTT Broker.

All I get is the system/0/serial message ...once - if I for example subscribe to "N/f6473bd7384a/solarcharger/258/Yield/Power " nothing happens ...

BR

Gawan

if the Multiplus gets too warm, it reduces its performance. Can I see via MQTT how much power it can currently deliver?

Michael

I have the same Problem, trying get data from the cerbo broker using a python program.Using node red there is no problem. Could somebody give me some help. The program and output is below
Your help is very much appreciated

import paho.mqtt.client as mqtt

import time

def on_message(client,userdata,message):

Topic=str(message.topic)

Nachricht=message.payload.decode("utf-8")

print (Topic,Nachricht)

def on_log(client,userdata,level,buf):

print("log:",level,buf)

def on_connect(client,userdata,flags,rc):

if rc==0: print("connected ok",rc)

else: print("Bad connection Return code=",rc)

client= mqtt.Client("laptop")

client.on_message=on_message

client.on_connect=on_connect

client.on_log=on_log

cerbo_broker="192.168.178.40"

client.connect(cerbo_broker)

client.subscribe("R/48a7da88e38b/system/0/Ac/Grid/L1/Power")

client.subscribe("R/48a7da88e38b/system/0/Dc/Battery/Voltage")

while True:

time.sleep(4)

client.loop_start()

The output is:

log: 16 Sending CONNECT (u0, p0, wr0, wq0, wf0, c1, k60) client_id=b'laptop'
log: 16 Sending SUBSCRIBE (d0, m1) [(b'R/48a7da88e38b/system/0/Ac/Grid/L1/Power', 0)]
log: 16 Sending SUBSCRIBE (d0, m2) [(b'R/48a7da88e38b/system/0/Dc/Battery/Voltage', 0)]
log: 16 Received CONNACK (0, 0)
connected ok 0

You should publish an empty message once in 30 seconds to R/##############/keepalive to get all topics provided by MQTT on a regular basis. If you need only specific sub-trees you can send them as payload to the same topic, e.g.:

Topic: R/##############/keepalive

Payload: ["vebus/#", "pvinverter/#","battery/#","grid/#", "solarcharger/#"]

thanks, however I still don't get data from the cerbo, although I have changed the while loop:

z=0

while True:

z+=1; print (z)

if z==5: client.loop_start();z=0; client.subscribe("R/xxxxxxx/keepalive")

else: time.sleep(4); client.loop_start()

console output:

log: 16 Sending CONNECT (u0, p0, wr0, wq0, wf0, c1, k60) client_id=b'laptop'
log: 16 Sending SUBSCRIBE (d0, m1) [(XXXXXXXXXXXX/system/0/Ac/Grid/L1/Power', 0)]
log: 16 Sending SUBSCRIBE (d0, m2) [(XXXXXXXXXX/system/0/Dc/Battery/Power', 0)]
1
2
log: 16 Received CONNACK (0, 0)
connected ok 0
log: 16 Received SUBACK
log: 16 Received SUBACK

....

5
log: 16 Sending SUBSCRIBE (d0, m4) [(b'R/XXXXXXXXX/keepalive', 0)]

You have to publish, not subscribe to R/###########/keepalive.