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Release Notes

v1.2.1

  • New meter type supported: NES/Echelon (ANSI C12.18): These meters do not send data on their own — they only answer when asked, and reading them requires a meter password from your metering point operator. The device now detects them by itself and guides you through entering the password in the web interface; a yellow status indicator shows while the password is still missing. So the meter can keep communicating with the grid operator undisturbed, the device logs off cleanly at regular intervals; the polling interval and a daily quiet period can be configured
  • The transformer ratio now applies at all times — please check your meter readings: The transformer ratio set under "Settings → Advanced" was previously only applied when the device had connected to the meter in one particular way. In every other case it had no effect and the readings were too low by that factor; after an interruption in reading they could jump to the correct value and fall back again at the next restart. The factor now applies regardless of how the connection was established. Devices with a transformer ratio configured will show correspondingly higher — and correct — values after the update; history already recorded stays as it is. Reactive energy is now converted as well, the one quantity that had been left without the factor
  • Modbus: SunSpec Model 213 now also available: Alongside the existing Model 203 (integers with a scale factor), the device now provides the same measurements as floating-point numbers. Clients reading Model 213 no longer need to evaluate scale factors. Existing Model 203 configurations remain valid and unchanged
  • Settings are stored reliably: The password for the second Wi-Fi network and the selected language could be lost when saving — both are now kept
  • General stability and diagnostic improvements in the background

v1.2.0

  • Modbus: wider power range — please check your client configuration: The power registers were previously limited to ±32.7 kW; larger installations silently reported a value that was too low. The range now extends to ±327 kW, in 10 W steps. Systems that read the scale factor from register 40092 (W_SF) adjust automatically. Systems with a hard-coded factor — including some Loxone, EVCC or openWB configurations — will show ten times the actual power after the update and need a one-time adjustment. Voltage, current, frequency and the energy meter readings are unaffected
  • Modbus: complete register overview: The Modbus status endpoint now lists every register the device actually serves — including total current and average voltage — and reports the raw value, the scale factor and the corresponding scale-factor register for each entry. This makes it possible to configure a Modbus client directly from this overview, without consulting the SunSpec specification. If a value falls outside the representable range, the device now explicitly reports "no value" instead of a plausible-looking number
  • General stability and diagnostic improvements under the hood

v1.1.9

  • Improved meter detection: meters using plain-text protocols (e.g. Logarex LK13BE) and meters operating in request mode are now detected and read reliably
  • Correct energy totals for multi-tariff meters (e.g. Elster AS1440): the total reading is now derived from all tariff registers — consistent across live data, history, MQTT, cloud, Modbus and cost calculation
  • More accurate daily figures: costs and consumption are now attributed to the correct day on locally connected devices
  • General stability and diagnostics improvements under the hood

v1.1.8

  • Improved feed-in detection on EMH meters: some EMH eHZ meters only report the import register (OBIS 1.8.0) but signal the energy direction in their status word during feed-in. This is now evaluated — the instantaneous power automatically gets the correct negative sign when feeding in. Reflected in live data, history, MQTT, cloud, Modbus and web API
  • More robust against faulty meter telegrams: implausible power spikes caused by occasional corrupted data telegrams from some meters are now detected and filtered out instead of briefly showing nonsensical values
  • Fixed rare crashes during Wi-Fi handovers: in environments with frequent Wi-Fi re-connections, devices could reboot in rare cases — the root cause has been eliminated
  • General stability and diagnostics improvements under the hood

v1.1.7

  • Transformer ratio for current-transformer metering: meters in semi-indirect installations (e.g. 250A/5A = ratio 50) only display secondary values — the new transformer ratio under "Settings → Advanced" automatically converts currents, power values and energy readings to the actual primary values. Voltage remains unchanged. Applied consistently across live data, history, MQTT, cloud, Modbus and cost calculation
  • Feed-in details in the cost view: the daily and monthly cost breakdown now reports import and feed-in separately — including feed-in remuneration and balance per day or month. Particularly useful for PV systems and balcony power plants, available directly on the device even without a cloud account
  • Start firmware updates directly: new button in the device web interface under "Settings → Updates"
  • Improved crash diagnostics and general stability improvements in the background

v1.1.6

  • Modbus TCP reliable again: connection issues with Modbus TCP clients fixed
  • Extended diagnostics options
  • General stability improvements in the background

v1.1.5

  • Manage tariffs and electricity costs directly on the device: electricity prices with base fee, working price and feed-in tariff can now be configured — current, monthly and yearly costs are calculated and shown both in the app and via the web API
  • Support for pure PV feed-in meters: meters that only send the currently fed-in power (OBIS 2.7.0) are now recognised correctly. The instantaneous power is derived with the correct sign (negative = feed-in) — visible in live data, history, MQTT, cloud, Modbus and web API
  • Static IP address configurable: devices in networks with unreliable automatic IP allocation (DHCP) can now operate with a fixed IP address — configurable per WiFi profile in the device's web interface under "Settings → WLAN"
  • More meter values with plain-text labels: tariffs 5 through 8 for both import and export, per-phase feed-in power (OBIS 22/42/62.7.0), status word and manufacturer identifier are now displayed with readable labels instead of "Unknown" — particularly relevant for Easymeter devices and other multi-tariff meters
  • General stability and diagnostics improvements in the background

v1.1.4

  • Dynamic WiFi transmit power: the device now adjusts its output to match the actual signal strength. Power draw drops noticeably with good reception, while full range is preserved when needed
  • General background stability improvements

v1.1.3

  • Consistent JSON format on the history endpoint of the web API

v1.1.2

  • New synthetic export counter (OBIS 2.8.0) for single-direction meters with PV / balcony solar setups: if the meter telegram does not include an exported-energy reading, the value is now derived from the live power — visible in live data, history, MQTT, cloud, Modbus and the web API
  • More stable daily update check: occasional reboots during the nightly update check on unstable WiFi links are gone
  • Consistent JSON format on the system info endpoint of the web API

v1.1.1

  • Reliable cloud connection in complex WiFi networks (mesh, repeaters): live readings would previously arrive late or not at all on unstable links
  • Correct handling of certain meter readings: occasional misinterpretation of individual OBIS values fixed
  • More stable behaviour at the WiFi range edge: no more unnecessary reboots on persistently weak signal

v1.1.0

  • New Modbus TCP server (SunSpec) for integration with Loxone, openHAB and other home automation systems
  • Automatic firmware updates: available updates are installed during the nightly update check (toggleable in the settings)
  • More robust Wi-Fi password handling: special characters (umlauts, €, …) are stored reliably; input fields warn about whitespace from copy/paste or overlong passwords
  • More stable history storage: old daily files are removed consistently after 30 days, with a permanent 200 KB reserve for updates
  • Settings page extended with new sections for Modbus and Updates

v1.0.9

  • New central settings page in the web interface for Wi-Fi, access point, time, MQTT, and cloud connection
  • Configurable name and password for the access point; AP state is retained across reboots
  • More stable Wi-Fi connection, especially in mesh networks (UniFi, FRITZ!Mesh)
  • More robust reception of smart meter telegrams under load
  • Smoother reconnect after MQTT or cloud outages with progressively longer back-off intervals
  • Improved diagnostics for OTA updates; old historical data files are reliably removed after 30 days

v1.0.8

  • Fixed sporadic measurement outliers on certain meter types (including Landis+Gyr). Occasional erroneous readings transmitted by the meter are now reliably filtered out.

v1.0.7

  • Support for meters that only send tariff registers (e.g. 1.8.1) instead of total registers (1.8.0)
  • Faster value updates for SML meters by disabling the median filter
  • Configurable median filter for OBIS/D0 meters (1–9, default: 5)
  • Minimum MQTT send interval clamped to 1 second

v1.0.6

  • Support for export meters that only report OBIS 15.7.0 (absolute power) instead of 16.7.0 (signed power). Current power is now correctly displayed in the dashboard for these meters.

v1.0.5

  • Improved SML parser
  • Improved stability: fixed reboots on WiFi connection loss and network changes
  • Correct daylight saving time switching
  • New endpoint for remote diagnostics (MQTT telemetry)

v1.0.4

  • Fixes an issue where meters with binary identifiers did not show live data on the dashboard and in the app
  • Automatically detects locked smart meters and shows a notice in the dashboard and in the app
  • Improves device reboot stability on weak power supplies

v1.0.3

  • Improved stability on unstable WiFi connections (device could restart in rare cases after a connection drop)
  • Support for smart meters with many readings (e.g. phase angles, per-phase currents) – the local dashboard now displays all values correctly

v1.0.2

  • Improved support for special characters in network name and password during WiFi setup via app (e.g. backslash, quotes)
  • Correct display of WiFi names with special characters in system info and settings
  • WiFi scan via app now correctly shows network names with special characters

v1.0.1

  • Extended live chart time range: now shows 60 minutes instead of 5 minutes
  • Access Point no longer starts unexpectedly after a software reboot

v1.0.0 – Initial Release

First stable firmware version for the WattWächter Plus.