esphome_api

A Go library to manage ESPHome devices.

This Go library provides a client implementation for interacting with ESPHome devices using the native ESPHome API. It enables developers to control and monitor ESPHome devices programmatically from Go applications. The library offers functionalities for establishing connections, authenticating, sending commands, subscribing to state updates, and receiving device information.

Installation

To install the esphome_api library, use the following command:

go build -o esphome ./cli/main.go

Usage

1. Import the Library

import (
        "fmt"
        "log"
        "time"

        "github.com/mycontroller-org/esphome_api/pkg/api"
        "github.com/mycontroller-org/esphome_api/pkg/client"
        "google.golang.org/protobuf/proto"
)

2. Create a Client

// Replace with your ESPHome device's address and encryption key (if applicable)
address := "esphome.local:6053"
encryptionKey := "YOUR_ENCRYPTION_KEY"

// Create a new ESPHome API client
client, err := client.GetClient("my-client-id", address, encryptionKey, 10*time.Second, handleFunc)
if err != nil {
        log.Fatalln(err)
}
defer client.Close()

3. Connect and Authenticate (if required)

// If your device requires authentication, log in with the password
password := "YOUR_PASSWORD"
if err := client.Login(password); err != nil {
        log.Fatalln(err)
}

4. Send Commands and Receive State Updates

// Example: Subscribe to state updates
if err := client.SubscribeStates(); err != nil {
        log.Fatalln(err)
}

// Example: Send a command to a light entity
lightKey := uint32(12) // Replace with the key of your light entity
if err := client.Send(&api.LightCommandRequest{
        Key:   lightKey,
        State: true, // Turn the light on
}); err != nil {
        log.Fatalln(err)
}

5. Handle Incoming Messages

// Define a handler function to process incoming messages
func handleFunc(msg proto.Message) {
        switch msg := msg.(type) {
        case *api.LightStateResponse:
                fmt.Printf("Light state update: Key=%d, State=%t\n", msg.Key, msg.State)

        case *api.BinarySensorStateResponse:
                fmt.Printf("Binary sensor state update: Key=%d, State=%t\n", msg.Key, msg.State)

        // Handle other message types as needed
        default:
                fmt.Printf("Received message of type: %T\n", msg)
        }
}

Configuration Example

The following is a complete configuration example for the esphomectl CLI tool, which utilizes the esphome_api library:

File: ~/.esphomectl.yaml

active: esphome.local:6053
devices:
    - address: esphome.local:6053
      password: BASE64/YOUR_ENCODED_PASSWORD
      encryptionKey: YOUR_ENCRYPTION_KEY
      timeout: 10s
      info:
          name: My ESPHome Device
          model: NodeMCU
          macAddress: AC:BC:32:89:0E:A9
          esphomeVersion: "1.15.0"
          compilationTime: "2023-10-26T10:00:00"
          usesPassword: true
          hasDeepSleep: false
          statusOn: 2023-10-26T12:00:00+05:30

Note: The password is encoded in Base64 format. You can encode your password using the following command:

echo -n "YOUR_PASSWORD" | base64

Examples

The examples directory contains various examples demonstrating the usage of the esphome_api library for different purposes, such as:

• camera: Capture images from an ESPHome camera.
• device_info: Retrieve device information from an ESPHome device.
• tail_logs: Subscribe to and display logs from an ESPHome device.