Better Support for Solarflow Batteries without Cloud

[vaterlangen]

This MR adds a new battery provider (index 7) to support Zendure Solarflow batteries using local MQTT broker.

Preconditions

In order to use this integration, the Solarflow system has to be "disconnected from cloud" (aka. configured to use the local MQTT broker instead of the pre configured vendor cloud). Please refer https://github.com/reinhard-brandstaedter/solarflow-bt-manager for details. If one can adjust answers on DNS queries (e.g. using OpenWRT as router), Solarflow can also be "disconnected from cloud" by returning the local broker IP for requests to mqtteu.zen-iot.com. The broker should be configured without authentication - or one has to gather the username passoword used by Solarflow.

Features

• Query battery status from Solarflow
• Display stats on LiveView
• Publish stats via MQTT
• HASS auto-discovery
• Auto detection of AB1000 and AB2000 packs (currently only tested with my AB2000)
• Time-sync for Solarflow
• Sending settings to Solarflow
• Set Zendure output limit fixed or via schedule (relative to sunrise/fall)
• Configurable full charge intervals for battery (or better: BMS) conditioning

Main Page with battery data read from Solarflow

Configuration of new battery provider

Testing

Tested with my local setup consisting of

• 1x HUB1200 / HUB2000
• 2x AB2000
• 1x HMT-2250
• Mosquitto as local MQTT broker

[vaterlangen]

Removed accidentally pushed stuff from branch

[AndreasBoehm]

I am wondering why we need this PR if there is already support for Zendure Batteries after this PR (#1127) has been merged? Or is that a different way to setup the battery?

[vaterlangen]

With this PR, all battery data is read and displayed (as shown in the screenshot) - not only voltage and soc as implemented by #1127.It iis intended for Solarflow instances, that are not connected to the vendor cloud (but using local MQTT broker, as this requires sending some commands to the device, too) and not using the vendor App. On the settings page, one can already adjust some parameters, as maximum output power and soc limits.

As I discovered a better way to read data from the device, I'm currently reworking the code.

[vaterlangen]

Initial post completely updated and ready for review