feat(esphome): Add initial irrigation system configuration

This commit introduces the initial ESPHome configuration for the irrigation system.

- `irrigation_system.yaml`: ESPHome configuration with Modbus valve control.

- `create_secrets.py`: Script to generate `secrets.yaml`.

- `secrets.yaml.example`: Example secrets file.

- `requirements.txt`: Python dependencies.

- `.gitignore`: Standard ESPHome gitignore file.
Signed-off-by: Eduard Iten <eduard@iten.pro>

software/esphome/.gitignore

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+# Gitignore settings for ESPHome
+# This is an example and may include too much for your use-case.
+# You can modify this file to suit your needs.
+/.esphome/
+/secrets.yaml

software/esphome/create_secrets.py

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+#!/usr/bin/env python3
+
+import secrets
+import string
+import os
+import base64
+from ruamel.yaml import YAML
+
+def generate_password(length=32):
+    """Generate a random password."""
+    alphabet = string.ascii_letters + string.digits
+    return ''.join(secrets.choice(alphabet) for i in range(length))
+
+def generate_api_key():
+    """Generate a random 32-byte key and base64 encode it."""
+    return base64.b64encode(secrets.token_bytes(32)).decode('utf-8')
+
+SECRETS_FILE = 'secrets.yaml'
+# In a real ESPHome project, secrets are often included from a central location
+# but for this script, we'll assume it's in the current directory.
+# You might need to adjust this path.
+secrets_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), SECRETS_FILE)
+
+yaml = YAML()
+yaml.preserve_quotes = True
+# To prevent line wrapping
+yaml.width = 4096
+
+try:
+    with open(secrets_path, 'r') as f:
+        secrets_data = yaml.load(f)
+    if secrets_data is None:
+        secrets_data = {}
+except FileNotFoundError:
+    print(f"Info: '{SECRETS_FILE}' not found. A new file will be created.")
+    secrets_data = {}
+
+# Generate new random passwords
+new_api_key = generate_api_key()
+new_ota_password = generate_password()
+
+# Update the dictionary with the new passwords
+if 'api_password' in secrets_data:
+    del secrets_data['api_password']
+secrets_data['api_key'] = new_api_key
+secrets_data['ota_password'] = new_ota_password
+
+# Write the updated dictionary back to the YAML file
+with open(secrets_path, 'w') as f:
+    yaml.dump(secrets_data, f)
+
+print(f"Successfully updated '{SECRETS_FILE}'.")
+print("New values:")
+print(f"  api_key: {new_api_key}")
+print(f"  ota_password: {new_ota_password}")

software/esphome/irrigation_system.yaml

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+esphome:
+  name: irrigation-system
+  friendly_name: Bewässerung
+
+esp32:
+  board: esp32-c6-devkitm-1
+  framework:
+    type: esp-idf
+
+wifi:
+  ssid: !secret wifi_ssid
+  password: !secret wifi_password
+  fast_connect: true
+
+api:
+  encryption:
+    key: !secret api_key
+
+ota:
+  platform: esphome
+  password: !secret ota_password
+
+logger:
+
+web_server:
+
+# UART-Bus für Modbus
+uart:
+  id: uart_bus
+  tx_pin: GPIO1
+  rx_pin: GPIO2
+  baud_rate: 9600
+  stop_bits: 1
+  parity: NONE
+
+# Modbus-Komponente (der Hub)
+modbus:
+  - id: modbus1
+    uart_id: uart_bus
+
+modbus_controller:
+  - id: valve_device
+    address: 0x01
+    modbus_id: modbus1
+
+number:
+  - platform: modbus_controller
+    modbus_controller_id: valve_device
+    id: valve_controller_command
+    name: "Valve Control"
+    address: 0x01
+    value_type: U_WORD
+    # min_value: 0
+    # max_value: 2
+    # step: 1
+
+globals:
+  - id: my_valve_is_open
+    type: bool
+    restore_value: false
+    initial_value: 'true'
+
+valve:
+  - platform: template
+    name: "Modbus Ventil"
+    id: my_modbus_valve
+
+    # Lambda, um den aktuellen Zustand zu bestimmen
+    # Liest den Zustand aus der globalen Variable
+    lambda: |-
+      return id(my_valve_is_open);
+
+    # Aktion beim Drücken auf "Öffnen"
+    open_action:
+      - number.set:
+          id: valve_controller_command
+          value: 1
+      - globals.set:
+          id: my_valve_is_open
+          value: 'true'
+
+    # Aktion beim Drücken auf "Schliessen"
+    close_action:
+      - number.set:
+          id: valve_controller_command
+          value: 2
+      - globals.set:
+          id: my_valve_is_open
+          value: 'false'
+
+    # (Optional) Aktion beim Drücken auf "Stopp"
+    stop_action:
+      - number.set:
+          id: valve_controller_command
+          value: 0
+
+sensor:
+- platform: modbus_controller
+  modbus_controller_id: valve_device
+  name: "Supply Voltage"
+  register_type: read
+  device_class: voltage
+  entity_category: diagnostic
+  accuracy_decimals: 2
+  filters:
+    - lambda: |-
+        return x / 1000.0;
+  address: 0x00F5
+  unit_of_measurement: "V"
+  value_type: U_WORD
+

software/esphome/requirements.txt

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+ruamel.yaml
+esphome

software/esphome/secrets.yaml.example

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+wifi_ssid: 'PUT YOUR WIFI SSID HERE'
+wifi_password: 'PUT YOUR WIFI PASSWORD HERE'
+api_key: 'PUT YOUR KEY HERE OR USE create_secrets.py'
+ota_password: 'PUT YOUR KEY HERE OR USE create_secrets.py'