User
Manual
V
ersion 1.21 December, 2018
41
copyright 2018 EVTV LLC
You will note the “
timestamp
” in the data display updates regularly.
This topic contains quite a bit of data about your battery system. We
basically put everything but the kitchen sink in one topic for a reason.
Amazon bills based on the rate of $1 per million messages. But messages
can be up to 5kb in length. So it is less expensive to put all data in a single
message rather than many brief messages.
Once you have your basic Battery Display acting to receive data on a
matching UDP port from the ESP32 BMS Controller, and publishing MQTT
messages as an MQTT SENDER with your BMS ID, you can then set ANY
number of additional Battery Displays up as MQTT RECEIVER. But note
that that display will need to load the same three files from the BATTERY
thumb drive at least once on powerup, and have the same BMS ID entered
on its configuration screen. It will then display the same BMS data echoed
through the AWS Iot Core.
It is important to note that the
MQTT SENDER
battery display must be on the
same wireless hub as the ESP32 BMS Controller so it can receive data over
UDP.
But you can have any number of
MQTT RECEIVER
displays, and each connected
to ANY wireless hub with Internet connectivity anywhere in the world.
