Merge Plugin milesight_iot_em400_udl into Main

milesight-iot-em400-udl/CHANGELOG.md

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+# Changelog 
+
+## 1.0.0 - 2026-04-16
+
+- First version of plugin

milesight-iot-em400-udl/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.

milesight-iot-em400-udl/README.md

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+# EM400-UDL - Ultrasonic Distance Sensor
+
+The EM400-UDL is a non-contact ultrasonic distance sensor designed for outdoor applications such as monitoring water level, fill level of tanks and silos, presence of objects, or snow level. Equipped with replaceable batteries and IP67 waterproof enclosure, it provides reliable long-term operation in harsh environmental conditions.
+
+## Features
+
+- **Multiple Range Options**: Selective probes vary from 25 to 1000 cm for different applications
+  - Standard Version: C050 (25-500 cm), C100 (25-1000 cm)
+  - Pro Version: W050 (30-500 cm), W100 (50-1000 cm)
+- **High Accuracy**: ± (1+0.3%*S) cm for standard version, ±1% FS for pro version
+- **Long Battery Life**: Two built-in 9000 mAh replaceable ER26500 Li-SOCL2 batteries for up to 10 years operation
+- **Built-in Sensors**: NTC temperature sensor (-40°C to 125°C) and 3-axis accelerometer for tilt detection
+- **Durable Design**: Damp-proof coating and IP67 waterproof enclosure for outdoor use
+- **NFC Configuration**: One-touch configuration via NFC, supports card emulation mode
+- **LoRaWAN® Connectivity**: Ultra-wide-distance wireless transmission up to 15 km line of sight
+- **LoRaWAN® Class A**: OTAA/ABP activation modes
+- **Frequency Bands**: CN470/IN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4
+- **Advanced Features**: Calibration, threshold alarm, tilt & distance switch, cumulative report (NB version)
+
+## Use Cases
+
+- Water level monitoring in rivers, wells, and reservoirs
+- Fill level monitoring in tanks and silos
+- Snow level measurement
+- Presence detection of objects
+- Flood warning systems
+- Waste management (bin level monitoring)
+- Industrial liquid storage monitoring
+
+## Technical Specifications
+
+### Measurement
+- **Distance Range**: 25 cm to 1000 cm (depending on probe model)
+- **Resolution**: 1 mm
+- **Temperature Range**: -40°C to 125°C
+- **Temperature Resolution**: 0.1°C
+
+### LoRaWAN®
+- **Frequency**: CN470/IN865/RU864/EU868/US915/AU915/KR920/AS923-1&2&3&4
+- **Tx Power**: 16 dBm (868 MHz), 20 dBm (915 MHz), 19 dBm (470 MHz)
+- **Sensitivity**: -137 dBm @300 bps
+- **Mode**: OTAA/ABP
+- **Class**: A
+
+### Physical
+- **Dimensions**: 65 x 80 x 118 mm
+- **Enclosure**: IP67
+- **Operating Temperature**: -30°C to 70°C
+- **Power Supply**: 2 x 9000 mAh ER26500 Li-SOCL2 batteries
+- **Battery Life**: > 10 years (LoRaWAN® version)
+
+## Thinger.io Integration
+
+The EM400-UDL can be seamlessly integrated into Thinger.io through standard LoRaWAN® network servers, enabling remote monitoring and management of distance measurements, temperature data, and device status.
+
+## Requirements
+
+A LoRaWAN® server is required to communicate the Milesight EM400-UDL 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 for threshold alarm configuration and device management.
+
+## Additional Resources
+
+Milesight resources can be found at:
+
+- [EM400-UDL Datasheet](https://resource.milesight.com/milesight/iot/document/em400-udl-datasheet-en.pdf)
+- [EM400-UDL User Guide](https://resource.milesight.com/milesight/iot/document/em400-udl-user-guide-en.pdf)
+- [Thinger.io Documentation](https://docs.thinger.io)