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Meshtastic-Android/docs/en/developer/adding-a-feature-module.md

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---
title: Adding a Feature Module
parent: Developer Guide
nav_order: 3
last_updated: 2026-05-13
aliases:
- new-module
- feature-module
- module-guide
---
# Adding a Feature Module
Step-by-step guide for creating a new KMP feature module in the Meshtastic project.
## 1. Create the Module Directory
```bash
mkdir -p feature/my-feature/src/{commonMain,commonTest,androidMain,jvmMain,iosMain}/kotlin/org/meshtastic/feature/myfeature
```
## 2. Create `build.gradle.kts`
```kotlin
plugins {
alias(libs.plugins.meshtastic.kmp.feature)
}
kotlin {
androidLibrary { withHostTest { } }
sourceSets {
commonMain.dependencies {
implementation(projects.core.common)
implementation(projects.core.navigation)
implementation(projects.core.resources)
implementation(projects.core.ui)
implementation(projects.core.di)
}
commonTest.dependencies {
implementation(libs.compose.multiplatform.ui.test)
}
jvmTest.dependencies {
implementation(compose.desktop.currentOs)
}
}
}
```
## 3. Register in `settings.gradle.kts`
Add your module to the main `include()` block:
```kotlin
include(
// ...existing modules...
":feature:my-feature",
)
```
## 4. Create the DI Module
`src/commonMain/kotlin/org/meshtastic/feature/myfeature/di/FeatureMyFeatureModule.kt`:
```kotlin
package org.meshtastic.feature.myfeature.di
import org.koin.core.annotation.ComponentScan
import org.koin.core.annotation.Module
@Module
@ComponentScan("org.meshtastic.feature.myfeature")
class FeatureMyFeatureModule
```
## 5. Register DI in App/Desktop
Add your module to:
- `androidApp/src/main/kotlin/org/meshtastic/app/di/AppKoinModule.kt`
- `desktopApp/src/main/kotlin/org/meshtastic/desktop/di/DesktopKoinModule.kt`
## 6. Add Navigation Routes
In `core/navigation/src/commonMain/kotlin/org/meshtastic/core/navigation/Routes.kt`:
```kotlin
@Serializable
sealed interface MyFeatureRoute : Route {
@Serializable data object MyFeatureGraph : MyFeatureRoute, Graph
@Serializable data object MyFeatureHome : MyFeatureRoute
}
```
## 7. Create Navigation Entries
`src/commonMain/kotlin/org/meshtastic/feature/myfeature/navigation/MyFeatureNavigation.kt`:
```kotlin
package org.meshtastic.feature.myfeature.navigation
import androidx.navigation3.runtime.EntryProviderScope
import org.meshtastic.core.navigation.MyFeatureRoute
fun EntryProviderScope<*>.myFeatureEntries() {
entry<MyFeatureRoute.MyFeatureHome> {
MyFeatureScreen()
}
}
```
## 8. Source Set Guidelines
| Source Set | Contains |
|-----------|----------|
| `commonMain` | Models, ViewModels, shared UI, DI module, navigation |
| `androidMain` | Android-specific implementations (e.g., platform APIs) |
| `jvmMain` | Desktop-specific implementations |
| `iosMain` | iOS-specific implementations |
| `commonTest` | Shared unit tests |
## 9. Testing Expectations
Every feature module should have:
- Unit tests in `commonTest` for business logic
- UI tests using `compose-multiplatform-ui-test` where appropriate
- No test dependency on other feature modules
## 10. Checklist
- [ ] Module directory created
- [ ] `build.gradle.kts` with correct plugins and dependencies
- [ ] Added to `settings.gradle.kts`
- [ ] DI module created with `@ComponentScan`
- [ ] DI module registered in app and desktop roots
- [ ] Routes added to `Routes.kt`
- [ ] Navigation entries registered
- [ ] `./gradlew kmpSmokeCompile` passes
- [ ] `./gradlew :feature:my-feature:allTests` passes
---