Merge Plugin dingtek_df556 into Main

dingtek-df556/CHANGELOG.md

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+# Changelog 
+
+## 1.0.0 - 2026-06-09
+
+- First version of plugin

dingtek-df556/LICENSE.md

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+Copyright 2026 Thinger.io
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

dingtek-df556/README.md

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+# DF556 - Pressure Tank Level Sensor
+
+The CNDingtek DF556 is a pressure type level sensor for various tanks, which is installed on top of the tank. It provides pressure-based immersed liquid level measurement with high accuracy and wireless LoRaWAN connectivity for remote monitoring applications.
+
+## Features
+
+- **Pressure-based liquid level measurement** with submerged pressure transducer
+- **Measurement range**: 2.5m to 15m (standard 2.5m, customizable)
+- **High accuracy**: 0.5% FS
+- **Resolution**: 1mm
+- **Built-in sensors**: Level, GPS, Temperature
+- **LoRaWAN wireless connectivity** for long-range data transmission
+- **IP67 enclosure** for harsh environments
+- **Operating temperature**: -20°C to 70°C
+- **Dimensions**: 122 x 96 x 96mm (body), 140 x 30 x 30mm (pressure part)
+- **Diameter**: 95mm
+- **Cable length**: 2.5m (customizable)
+- **Battery-powered** for wireless operation
+
+## Use Cases
+
+- Water tank level monitoring
+- Fuel tank level measurement
+- Chemical storage tank monitoring
+- Industrial liquid level control
+- Agricultural water reservoir management
+- Municipal water supply systems
+
+## Thinger.io Integration
+
+The DF556 seamlessly integrates with Thinger.io through LoRaWAN connectivity, enabling remote monitoring and management of tank levels with real-time data visualization and alerting capabilities.
+
+## Requirements
+
+A LoRaWAN server is required to communicate the CNDingtek DF556 into Thinger.io, some options are:
+
+- [The Things Stack](https://www.thethingsindustries.com/stack/)
+- [LORIOT](https://loriot.io/)
+- [ChirpStack](https://www.chirpstack.io/)
+
+Alongside, the corresponding plugin for the selected LoRaWAN server needs to be installed in your Thinger.io instance.
+
+## Get Started
+
+### Installation
+
+Look for the plugin in the [Thinger.io Plugin Store](https://marketplace.thinger.io/) and install it in your Thinger.io instance. Once the plugin is installed a new Product will be created for this device.
+
+### Configuration
+
+The Product is already preconfigured, check that the auto provision prefix matches the one selected in your LoRaWAN server plugin in Thinger.io, or change it to your desire.
+
+### Usage
+
+Start sending uplinks for autoprovisioning devices and buckets.
+This product also provides a predefined dashboard and downlinks.
+
+## Additional Resources
+
+CNDingtek resources can be found at:
+
+- [DF556 Product Page](https://www.dingtek.com/pressure-liquid-level-sens-df556)
+- [Device Repository](https://www.thethingsnetwork.org/device-repository/devices/dingtek/df556)
+- [Thinger.io Documentation](https://docs.thinger.io)