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A Garmin widget that displays data from evcc, an open-source software solution for solar-powered EV charging.

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# evccg

evccg is a Garmin wearable app that displays real-time data from evcc, an open-source platform for solar-optimized EV charging.

You can find the app in the Garmin Connect IQ store:
 https://apps.garmin.com/apps/2bc2ba9d-b117-4cdf-8fa7-078c1ac90ab0

The user manual is published via GitHub Pages at: https://evccg.metiq.com

# Table of Contents

This README covers the following topics:

- [Introduction](#introduction)

- [Project Structure](#project-structure)
  - [Root Folder `/`](#root-folder-)
  - [Folder `/ciq-store`](#folder-ciq-store)
  - [Folder `/docs`](#folder-docs)
  - [Folder `/icons`](#folder-icons)
  - [Folders `/resources`](#folders-resources)
  - [Folder `/screenshots`](#folder-screenshots)
  - [Folder `/scripts`](#folder-scripts)
  - [Folder `/source`](#folder-source)
- [Build Instructions](#build-instructions)
  - [To Run the App in the Garmin Simulator](#to-run-the-app-in-the-garmin-simulator)
  - [To Compile for a Single Device](#to-compile-for-a-single-device)
  - [To Compile for All Devices and Export `.iq` File for Upload](#to-compile-for-all-devices-and-export-iq-file-for-upload)
  - [Modifications in `source-annot-glance`](#modifcations-in-source-annot-glance)
  - [To Add a New Device](#to-add-a-new-device)
  - [To Generate the Device-Specific Icons](#to-generate-the-device-specific-icons)
    - [How the App Selects Font Sizes](#how-the-app-selects-font-sizes)
      - [1. Vector Font Mode (Modern Devices)](#1-vector-font-mode-modern-devices)
      - [2. Static Mode](#2-static-mode)
      - [3. Static Optimized Mode](#3-static-optimized-mode)
    - [Generating Icons for a New Device](#generating-icons-for-a-new-device)
    - [Adding, Removing or Modifying Icons](#adding-removing-or-modifying-icons)
      - [1. `generate.json`](#1-generatejson)
      - [2. `drawables*.xml`](#2-drawablesxml)
      - [3. `EvccResourceSet.mc`](#3-source_baseevccresourcesetmc)
    - [Generating the Device-Specific PNG Files](#generating-the-device-specific-png-files)
- [Exception Messages](#exception-messages)
- [Supported Devices](#supported-devices)
- [Helpful Tips and Notes](#helpful-tips-and-notes)

# Introduction

Built using the Garmin Connect IQ SDK, evccg includes the following application types:

- **Glance**: A quick overview of site statistics.
- **Widget**: The main interface, including detail views for multiple sites.

**Further reading**:

- [evccg User Manual](https://evccg.metiq.com)
- [evccg User Manual - Glance](https://evccg.metiq.com/#glance)
- [evccg User Manual - Widget](https://evccg.metiq.com/#widget)
- [Connect IQ for Developers](https://developer.garmin.com/connect-iq)
- [Connect IQ SDK](https://developer.garmin.com/connect-iq/sdk/)

# Project Structure

The project is organized into the following directories:

## Root Folder `/`

The root directory contains essential project files.

**Key files:**

- `README.md`: This file
- `manifest.xml`: Defines the app's structure, supported devices, and required permissions (e.g., storage, background tasks)
- `monkey.jungle`: The build script that determines available features per device. It includes extensive documentation in the file itself.

**Further reading:**

- [evccg User Manual - Supported Devices](https://evccg.metiq.com/#supported-devices): outlines the capabilities of each device
- [Connect IQ SDK Core Topics - Manifest and Permissions](https://developer.garmin.com/connect-iq/core-topics/manifest-and-permissions/)  
- [Connect IQ SDK Core Topics - Build Configuration](https://developer.garmin.com/connect-iq/core-topics/build-configuration/)

## Folder `/.vscode`

Contains VS Code customizations.

**Key files:**

- `tasks.json`: defines custom build tasks.
  - evccg: Generate Icons for All Devices - see [further below for details](#generating-the-device-specific-png-files)
  - evccg: Copy drawables.xml for All Devices - see [further below for details](#generating-the-device-specific-png-files)
  - evccg: Generate Icons for epix2pro47mm - see [further below for details](#generating-the-device-specific-png-files)
  - evccg: evccg: Generate JQ - see [further below for details](#folder-scriptsgenerate-jq)

## Folder `/ciq-store`

Contains images used to present the app in the Connect IQ Store. The source files for the screenshots are located in [`/screenshots`](#folder-screenshots), while the versions in this folder are resized and optimized to meet the Connect IQ Store image size requirements.

## Folder `/docs`

Contains the user manual, published at <https://evccg.metiq.com>.

**Key files:**

- `README.md`: The user manual itself
- `_config.yml`: Theme configuration
- `assets/css/style.css`: Custom styles to adapt the theme

## Folders /resources*

In the Connect IQ SDK, resources define:

- **Properties**: Parameters stored outside the app, hidden to the user
- **Settings**: User-facing configurations
- **Drawables**: Image assets used by the app
- **Strings**: Text values like app name and version

**Folder breakdown:**

- `/resources/drawables/generated/[devicename]`: Drawables specific to individual devices. However, if multiple devices share the same font sizes, they can also share drawables. In such cases, only one folder is created for the shared drawables, typically named after one of the devices. The other devices then reference this folder in [`monkey.jungle`](#root-folder-). Similarly, in [`generate.json`](#to-generate-the-device-specific-icons), there will be a single entry for the shared drawable set.
- `/resources/drawables/src`: The SVG (vector) graphics used to generate the drawables, along with the XML resource definitions. Both are consumed by the [script](#folder-scriptsgenerate-drawables) that generates the device-specific drawable folders.
- `/resources/settings`: App settings visible to the user
- `/resources/strings`: Shared across all devices

**Further reading:**

- [Connect IQ SDK Core Topics - Resources](https://developer.garmin.com/connect-iq/core-topics/resources/)

## Folder `/screenshots`

Contains screenshots used both for the Connect IQ Store and the documentation.

## Folder `/scripts`

Contains scripts used to build the app.

### Folder `/scripts/generate-drawables`

This folder contains the SVG icon source files and scripts used to generate device-specific PNG icons.

Icons are created in multiple font sizes based on each device's display resolution and are stored in the corresponding [resource folders](#folders-resources-and-settings).

At runtime, the app dynamically selects the appropriate font size based on the displayed content.

**Key files:**

- `generate.json`: Defines font/icon sizes per device which icons to generate.
/- `drawables*.xml`: Garmin resource definition file that associates icon files with resource identifiers used in the source code. Three versions of this file exist, and one is copied—along with the corresponding generated PNGs—into each device-specific resource folder based on the device type.
- `generate.bat`: Generates icons.
- `generate.js`: JavaScript script, run by `generate.bat` using Windows Scripting Host

For more information on these files, see [To Generate the Device-Specific Icons](#to-generate-the-device-specific-icons).

### Folder `/scripts/generate-jq`

The app uses a server-side JQ filter to reduce the JSON returned by the evcc REST API to only the fields required by the app, as Garmin imposes relatively strict limits on incoming JSON payload sizes. In addition to filtering, the JQ logic also aggregates data for display purposes, such as the grid price forecast.

The JQ filter is passed from the Monkey C code as part of the HTTP request to evcc and therefore needs to be available in a minified form without comments or line breaks.

For easier editing, the source JQ is maintained in the formatted file `/source/jq/state.jq`. The scripts in this folder use it to generate `/source/jq/minified.mc`, a piece of Monkey C code that stores the minified JQ in a global variable.

`generate-jq.bat` can be executed from the command line and runs `generate-jq.js`, a WSH JavaScript script that generates the minified version.

## Folder `/source`

The app is written in **Monkey C**, Garmin's programming language, using the Connect IQ SDK API for UI, settings, persistent storage, and HTTP requests to evcc.

**Annotations:**

- `(:glance)` is used to isolate code used in the memory-constrained glance.
- Use of exclude annotations helps the build system tailor the code to each device (see the [root folder](#root-folder-) for details).

**Key files and directories:**

- `/source/main`: Main source code

- `app/EvccApp.mc`: Entry point for glance and widget modes
  - `data/`: Data layer, including evcc state representation, web request handling, storage, as well as access to app configuration and string resources
  - `shared/`: Shared components such as constants, exceptions, and helper functions
  - `ui/`: UI implementation for widget and glance

- `/source/properties`: Device-specific constants

- `base/DeviceProperties.mc`: Singleton providing property access with default values
  - `base/devices/[devicename]`: Optional overrides for device-specific properties

- `/source/jq`: The app uses a server-side JQ filter to reduce the JSON returned by the evcc REST API to only the fields required by the app, as Garmin imposes relatively strict limits on incoming JSON payload sizes. In addition to filtering, the JQ logic also aggregates data for display purposes, such as the grid price forecast.

- `state.jq`: Contains the formatted JQ source and should be modified when changes are needed.
  - `minified.mc`: Contains a minified version of the JQ stored in a Monkey C global variable. This file is generated by script; see [here](#folder-scriptsgenerate-jq) for details.
  
**Further reading:**

- [Connect IQ Core Topics](https://developer.garmin.com/connect-iq/core-topics/)  
- [Connect IQ API Reference](https://developer.garmin.com/connect-iq/api-docs/)

# Build Instructions

Follow the steps below to build, run, and test the app using the Connect IQ SDK and Garmin simulator.

## To Run the App in the Garmin Simulator

1. Install:
   - Visual Studio Code
   - Git
   - [Connect IQ SDK](https://developer.garmin.com/connect-iq/sdk/)
   - Monkey C extension for VS Code

2. Open VS Code and clone the `evcc-garmin` repository
3. Open any file in the `/source` folder
4. Press **F5** to start the simulator and select a target device
5. Go to `File` → `Edit Persistent Storage` → `Edit Application.Properties` and configure as needed  
   - Use `https://demo.evcc.io/` for testing if you don’t have a local instance  
   - To allow HTTP URLs, uncheck `Settings > Use Device HTTPS Requirements`

## To Compile for a Single Device

1. Press `CTRL+SHIFT+P` → `Monkey C: Build Current Project`

## To Compile for All Devices and Export `.iq` File for Upload

The following command generates the `.iq` file, which is used for uploading the app to the Garmin Connect IQ Store.

1. Make sure all debug statements are commented out. See [Removing Debug Statements](#removing-debug-statements) for details.
2. Press `CTRL+SHIFT+P` → `Monkey C: Export Project`

## To Add a New Device

To support a new device:

1. If the device isn't available in your current SDK, launch the **SDK Manager** and download/activate the latest version.

2. In `manifest.xml`, check the new device in the supported device list.

3. Configure device-specific features in the `monkey.jungle` build file (see [Root Folder `/`](#root-folder-)). You need to at least add an entry for the `resourcePath`. For `sourcePath` and `excludeAnnotations`, the default is a good starting point. You can launch the app in the simulator to evaluate whether any adjustments are needed. For example:

- If the app reports that vector fonts are not supported, switch to static fonts—or to static optimized fonts if standard sizes overlap.
   - If the select/enter button is not in the standard 30° position, switch to the appropriate option.
   - Set the appropriate exclude annotation for a round or rectangular screen.

4. Generate the icons for the new device following the steps described in [How to Generate Icons for a New Device](#how-to-generate-icons-for-a-new-device).

6. Test in the simulator (see [above](#to-run-the-app-in-the-garmin-simulator))

7. Export the project (`CTRL+SHIFT+P` → `Monkey C: Export Project`) and upload the `.iq` file to the Connect IQ Store

## To Generate the Device-Specific Icons

All icons are stored in SVG format in the [icons folder](#folder-icons). From these, device-specific PNGs are generated at multiple font sizes, tailored to each device's display resolution. The resulting PNGs are stored in the appropriate [resource folders](#folders-resources-and-settings).

At runtime, the app dynamically selects the appropriate icon size based on the displayed content. Font sizes per device are defined in `/scripts/generate-drawables/generate.json`.

Each icon also requires entries in `/resources/drawables/src/xml/drawables.xml` for every size it will be used at.

The following sections explain how font sizes are selected, how to add support for a new device, how to add new icons, and how to generate the PNGs.

### How the App Selects Font Sizes

For glances, a single font size is defined in `generate.json` under each device entry:

- `icon_glance` → always equaling `FONT_GLANCE` as defined by Garmin for the device

For the widget, five icon/font sizes are defined per device in `generate.json`:

- `icon_medium`
- `icon_small`
- `icon_tiny`
- `icon_xtiny`
- `icon_micro`

> **Note:** These entries do not set the font sizes themselves. Instead, they must **match the font sizes the app selects at runtime**, based on one of the three methods below:

#### 1. Vector Font Mode (Modern Devices)

Modern devices support scalable vector fonts, allowing the app to evenly distribute font sizes as needed.

- The app calculates `icon_medium` based on the standard `FONT_MEDIUM` and screen resolution.
- `icon_micro` is derived from `FONT_XTINY` and, if necessary, adjusted to maintain a proportional relationship to `FONT_MEDIUM`. 
- The remaining font sizes (`small`, `tiny`, `xtiny`) are evenly distributed between `medium` and `micro`.

You can enable debugging in `EvccUILibWidgetSingleton` to print the actual font sizes used at runtime.

#### 2. Static Mode

In static mode, the app uses the device’s built-in font sizes without modification. You can refer to Garmin’s [Device Reference](https://developer.garmin.com/connect-iq/reference-guides/devices-reference) for exact font dimensions per device.

The mapping is as follows:

- `icon_medium` → `FONT_MEDIUM`
- `icon_small` → `FONT_SMALL`
- `icon_tiny` → `FONT_TINY`
- `icon_xtiny` → `FONT_GLANCE`
- `icon_micro` → `FONT_XTINY`

#### 3. Static Optimized Mode

In this mode, the app still relies on the device's standard fonts, but improves distribution by filtering out duplicate sizes, resulting in a more balanced range.

You can enable debugging in `EvccUILibWidgetSingleton` to print the actual font sizes used at runtime.

> **Example:** If `FONT_SMALL` and `FONT_TINY` are the same size, the app might assign:

- `icon_medium` → `FONT_MEDIUM`
- `icon_small` → `FONT_SMALL`
- `icon_tiny` → `FONT_GLANCE`
- `icon_xtiny` → `FONT_XTINY`
- `icon_micro` → `FONT_XTINY`

### Generating Icons for a New Device

To determine the actual font sizes used by the app, follow these steps:

1. **Add an entry** to `generate.json` for the target device. You can use placeholder values for the icon sizes—copying from a similar existing device works fine. This step is only required to get the app running so you can retrieve the font sizes.

2. **Generate the icons** by running:  
   ```cmd
   generate.bat [device-family]
   ```  
   Replace `[device-family]` with the name of the entry you just added to `generate.json`.

2. **Ensure you added the device-specific `resourcePath`** in `monkey.jungle`, with the device-specific drawable path (see [above](#to-add-a-new-device)).

3. **Run the app in the simulator**, open the widget, and press the `m` key twice to open the system info view. The app will print the actual font sizes to the debug console.

4. **Update the `generate.json` entry** with the correct font sizes based on the output.

5. **Re-generate the icons** with the updated sizes:  
   ```cmd
   generate.bat [device-family]
   ```

**Example entries:**
```json
"venu2":{
    "fontMode":"static-opt",
    "logo_flash":"70",
    "logo_evcc":"22",
    "icon_medium":"58",
    "icon_small":"49",
    "icon_tiny":"43",
    "icon_xtiny":"32",
    "icon_micro":"32",
    "icon_glance":"43"
},
"fenix847mm": {
  "fontMode": "vector",
  "logo_flash": "65",
  "logo_evcc": "26",
  "icon_medium": "59",
  "icon_small": "53",
  "icon_tiny": "46",
  "icon_xtiny": "40",
  "icon_micro": "33",
  "icon_glance": "42"
}
```

**Explanation of fields:**

- `icon_*`: These values correspond to the font sizes selected by the app, based on the method described [above](#how-the-app-selects-font-sizes).
- `logo_flash`: Must match the **Launcher Icon Size** as listed in Garmin’s [Device Reference](https://developer.garmin.com/connect-iq/reference-guides/devices-reference).
- `logo_evcc`: The logo shown at the bottom of the screen. Typically set to 65% of `icon_xtiny`.
- `fontMode`: A comment indicating the font sizing mode used by the app for this device (e.g., `"vector"`, `"static"`, or `"static-optimized"`).

### Adding, Removing, or Modifying Icons

To add, remove, or change icons, you'll need to update the following files in the `/icons` directory:

#### **1. `/scripts/generate-drawables/generate.json`**

This file serves as input for the PNG generation script.

- The `device-families` entry, covered in the previous section, defines available icon sizes for each device family.
- The `files` section specifies how each SVG should be processed and which sizes to generate. Each entry includes:
  - **`anti-aliasing`**: Level of anti-aliasing applied by Inkscape (range: `0` = none, `3` = max).
  - **`types`**: An array of size identifiers (e.g., `icon_medium`) that match entries in `device-families`. PNGs will be generated for each type listed.
  - **`png-name`** (optional): For entries with only one `type`, this overrides the default PNG filename.

**Example:**
  ```json
  "files": {
    "battery_empty.svg": { 
      "anti-aliasing": "3", 
      "types": ["icon_glance", "icon_xtiny", "icon_tiny", "icon_small", "icon_medium"] 
    },
    "sun.svg": { 
      "anti-aliasing": "3", 
      "types": ["icon_xtiny", "icon_tiny", "icon_small", "icon_medium"] 
    },
    "evcc.svg": { 
      "anti-aliasing": "3", 
      "types": ["logo_evcc"], 
      "png-name": "logo_evcc.png" 
    }
  }
  ```

In this example:
- `battery_empty.svg` will be generated in multiple sizes for various UI contexts.
- `sun.svg` is limited to widget-specific sizes.
- `evcc.svg` is generated in a single size with a custom filename.

**Default PNG naming convention:**
```
<type>_<name>.png
```
Where:
- `<type>` = icon size (e.g., `icon_medium`)
- `<name>` = original SVG filename (without extension)

For example, the output PNGs for `sun.svg` would include:  
`icon_xtiny_sun.png`, `icon_small_sun.png`, etc.

#### **2. `/resources/drawables/src/xml/drawables.xml`**

Defines resources for use in the app via the Connect IQ SDK.

Each icon must have an entry for **every size** it's used in, and in **all applicable versions** of the drawables file.  
For example, the medium-sized `sun.svg` icon would be defined in both `drawables.xml` and `drawables-tinyglance.xml` like this:

```xml
<bitmap scope="foreground" id="sun_medium" filename="icon_medium_sun_crushed.png" packingFormat="png"/>
```

- `scope="foreground"` indicates the icon is only available in widget contexts.

**Further reading:**

- See the [Connect IQ SDK Resources documentation](https://developer.garmin.com/connect-iq/core-topics/resources/#resources) for more information on resource definitions.
- The [Connect IQ FAQ](https://developer.garmin.com/connect-iq/connect-iq-faq/how-do-i-optimize-bitmaps/#howdoioptimizebitmapsinmyapp) explains how to optimize bitmaps by reducing the color palette and removing transparency.

#### **3. `/source/main/ui/shared/assets/ResourceSets.mc`**

This file contains Monkey C classes that define resource sets used in the app. Each resource set defines font sizes to be used and maps them to the corresponding PNG resources.

- `EvccWidgetResourceSetBase`: Defines resources for **widgets**
- `EvccGlanceResourceSetBase`: Defines resources for **glances**

These mappings act as the bridge between the resource definitions in drawables.xml and the font sizes used in the Monkey C code.

### Generating the Device-Specific PNG Files

Whenever you make changes to `/icons/generate.json`, any of the `/icons/drawables*.xml`, or any of the SVG files, you need to run `generate.bat` to regenerate the device-specific PNG icons and copy `drawables.xml` into each device’s [resource folder](#folders-resources-and-settings).

Based on the `deviceType` specified in `generate.json`, the script selects the appropriate `drawables*.xml` version and generates certain icons without transparency.

You can run `generate.bat` with the following parameters:

- **No parameters**: Generates icons for **all devices**.
- **Device folder** (e.g. `resources-fenix7`): Generates icons only for that specific device.
- **`drawables.xml`**: Copies `drawables.xml` to all device resource folders **without generating icons**.

Alternatively, you can use the custom VS Code task defined in the project. Press `CTRL+SHIFT+B` and choose one of the following tasks to run the batch file from the integrated terminal.

- **evccg: Generate Icons for All Devices**: Generates icons for **all devices**.
 - **evccg: Copy drawables.xml for All Devices**: Copies `drawables.xml` to all device resource folders **without generating icons**.
 - **evccg: Generate Icons for \<device name\>**: Generates icons only for that specific device. **Note:** not available for all devices.

**Dependencies**

The script relies on the following third-party tools:

- **Inkscape** – Converts SVG files to PNG. It must be available in your system’s `PATH`.
- **pngcrush.exe** – Optimizes PNG files. This tool is included in the project directory and requires no installation.

# Exception Messages

To conserve memory, short codes are used for exception messages that result from programming errors (as opposed to user-related issues such as misconfiguration).

| Shortcode | Class | Description |
| ------------- | ------------------------ | ----------- |
| CENTANGINV<x> | EvccPageIndicator | setCenterAngle: <x> is not a valid value |
| DOTANGINV<x> | EvccPageIndicator | setDotDistanceAngle: <x> is not a valid value |
| FFNTFND | EvccResourceSets | Font faces not found |
| JUSTCENTONL | EvccHorizontalBlock | Vertical block supports only justify center |
| JUSTNOTSUP | EvccHorizontalBlock | Horizontal block does not support justification for elements |
| MTHDUN | EvccPreRenderContentTask | Unknown method |
| NODC | EvccBlock | :dc not set |
| NOFONT | EvccBlock | :font not set |
| NOIC<x>FOR<y> | EvccIconBlock | Icon <x> not found for font <y> |
| NOREZID | EvccBitmapBlock | ResourceId is missing |
| ORBITDEG<x> | EvccPageIndicator | orbitXY: <x> is not a valid value |
| VECNOTSUP | EvccResourceSets | Device does not support vector fonts |

# Supported Devices

A table listing supported devices and their features is available in the [user manual](https://evccg.metiq.com/#supported-devices).

Below is an additional reference for developers, showing the Connect IQ (CIQ) API level supported by each device.

| Device               | CIQ API Level |
|----------------------|---------------|
| fenix7               | 5.1.0         |
| fenix7s              | 5.1.0         |
| fenix7x              | 5.1.0         |
| epix2pro42mm         | 5.1.0         |
| epix2pro47mm         | 5.1.0         |
| epix2pro51mm         | 5.1.0         |
| fenix7pro            | 5.1.0         |
| fenix7pronowifi      | 5.1.0         |
| fenix7spro           | 5.1.0         |
| fenix7xpro           | 5.1.0         |
| fenix7xpronowifi     | 5.1.0         |
| fenix843mm           | 5.1.0         |
| fenix847mm           | 5.1.0         |
| fenix8solar47mm      | 5.1.0         |
| fenix8solar51mm      | 5.1.0         |
| fenix8pro47mm        | 5.1.0         |
| fr955                | 5.1.0         |
| fr165                | 5.1.0         |
| fr165m               | 5.1.0         |
| fr265                | 5.1.0         |
| fr265s               | 5.1.0         |
| fr965                | 5.1.0         |
| fr970                | 5.1.0         |
| venu2                | 5.0.0         |
| venu2plus            | 5.0.0         |
| venu2s               | 5.0.0         |
| venu3                | 5.1.0         |
| venu3s               | 5.1.0         |
| venux1               | 5.1.0         |
| venu441mm            | 5.1.0         |
| venu447mm            | 5.1.0         |
| vivoactive5          | 5.1.0         |
| vivoactive6          | 5.1.0         |

**Further reading**

- [Connect IQ SDK - Compatible Devices](https://developer.garmin.com/connect-iq/compatible-devices/)
- [Connect IQ SDK - Device Reference](https://developer.garmin.com/connect-iq/reference-guides/devices-reference)

# Helpful Tips and Notes

A collection of useful information for working on this project.

## Removing Debug Statements

While debug statements are only printed in debug builds, they still occupy code space in release builds. Therefore, when building a release, all debug statements should be commented out.

To find all active debug statements in VS Code, press `CTRL+SHIFT+H` to open the global search and replace panel. Enable regular expressions by clicking the `.*` icon next to the search field, and use the following pattern to locate all active debug statements:

```
(?<!\/\/ )Logger\.debug\(
```

To deactivate the debug statements, replace them with:

```
// Logger.debug(
```

This will comment them out without affecting any lines that are already commented.

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