meshtastic/meshtastic-sdk

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# meshtastic-sdk > Kotlin Multiplatform SDK for [Meshtastic](https://meshtastic.org) mesh-network radios. > One library. Connects to Meshtastic devices over BLE, TCP, or USB-serial from Android, JVM, and iOS. > Wasm/browser is on the roadmap — see [`docs/future/wasm-rpc-roadmap.md`](docs/future/wasm-rpc-roadmap.md). [![License: GPL-3.0-or-later](https://img.shields.io/badge/License-GPL--3.0--or--later-blue.svg)](LICENSE) [![Maven Central](https://img.shields.io/maven-central/v/org.meshtastic/sdk-core)](https://central.sonatype.com/artifact/org.meshtastic/sdk-core) [![CI](https://github.com/meshtastic/meshtastic-sdk/actions/workflows/ci.yml/badge.svg)](https://github.com/meshtastic/meshtastic-sdk/actions/workflows/ci.yml) [![codecov](https://codecov.io/gh/meshtastic/meshtastic-sdk/branch/main/graph/badge.svg)](https://codecov.io/gh/meshtastic/meshtastic-sdk) [![Revved up by Develocity](https://img.shields.io/badge/Revved%20up%20by-Develocity-06A0CE?logo=Gradle&labelColor=02303A)](https://community.develocity.cloud/scans?search.rootProjectNames=meshtastic-sdk) [![API Docs](https://img.shields.io/badge/docs-Dokka-blue)](https://meshtastic.github.io/meshtastic-sdk/) 📚 **[API Reference (Dokka)](https://meshtastic.github.io/meshtastic-sdk/)** — published from `main`. > **Status:** pre-1.0. APIs may change between minor versions; see [`docs/versioning.md`](docs/versioning.md). Track [`docs/`](docs/) for spec evolution. ## What this is A Kotlin library that talks to Meshtastic radios using the device's PhoneAPI (the same protocol the official `Meshtastic-Android` and `Meshtastic-Apple` apps use). It owns the wire-protocol details — handshake, NodeDB, ACK correlation, channel decryption, deferred-decrypt, retries — and exposes them as ergonomic Kotlin coroutines + flows + sealed types. Use it to build: - Companion apps (Android, iOS, desktop) that don't want to reinvent the protocol. - Headless gateways and mesh telemetry collectors on JVM/server. - (post-1.0) Web tools (wasm) via a sidecar RPC server — design parked in [`docs/future/wasm-rpc-roadmap.md`](docs/future/wasm-rpc-roadmap.md). This SDK does **not** include UI components, navigation, or storage policy — see [`docs/decisions/000-charter.md`](docs/decisions/000-charter.md) for the explicit non-goals. ## Install ```kotlin // build.gradle.kts dependencies { implementation("org.meshtastic:sdk-core:0.2.0") implementation("org.meshtastic:sdk-transport-tcp:0.2.0") // pick a transport implementation("org.meshtastic:sdk-storage-sqldelight:0.2.0") // pick a storage } ``` > Released versions are published to Maven Central. For bleeding-edge builds from `main`, use the snapshot repository below. Available transport modules: `transport-ble`, `transport-tcp`, `transport-serial` (single multiplatform module covering JVM and Android). Available storage modules: `storage-sqldelight`. Or roll your own `StorageProvider`. Optionally, depend on `sdk-bom` to align all module versions; see [`bom/README.md`](bom/README.md) for usage and [`docs/versioning.md`](docs/versioning.md#bom) for the versioning policy. ### Snapshot artifacts Every push to `main` publishes the patch after the latest release as `-SNAPSHOT` (`0.2.1-SNAPSHOT` after `0.2.0`) to the Sonatype Central snapshot repository: ```kotlin // settings.gradle.kts (or root build.gradle.kts repositories block) dependencyResolutionManagement { repositories { mavenCentral() maven("https://central.sonatype.com/repository/maven-snapshots/") { mavenContent { snapshotsOnly() } } } } // build.gradle.kts dependencies { implementation("org.meshtastic:sdk-core:0.2.1-SNAPSHOT") } ``` Snapshot artifacts are mutable and rebuilt on every commit to `main`. For reproducible builds, depend on a released version (e.g. `org.meshtastic:sdk-core:0.2.0`) rather than a `-SNAPSHOT`. Roadmap (post-1.0, non-breaking adds): `transport-mqtt-proxy`, `transport-rpc`, `host-rpc-server`, `wasmJs` browser support — see [`docs/future/wasm-rpc-roadmap.md`](docs/future/wasm-rpc-roadmap.md). Full module matrix: [`docs/architecture/module-graph.md`](docs/architecture/module-graph.md). ## Quick start ```kotlin import org.meshtastic.sdk.storage.sqldelight.SqlDelightStorageProvider import org.meshtastic.sdk.RadioClient import org.meshtastic.sdk.SendOutcome import org.meshtastic.sdk.transport.tcp.TcpTransport suspend fun run() { val client = RadioClient.Builder() .transport(TcpTransport(host = "meshtastic.local", port = 4403)) .storage(SqlDelightStorageProvider(baseDir = "/tmp")) // empty string = in-memory .build() client.connect() // throws MeshtasticException on failure val handle = client.sendText("hello mesh") when (val outcome = handle.await()) { // suspends until terminal SendOutcome.Success -> println("acked or rebroadcast heard") is SendOutcome.Failure -> println("failed: ${outcome.reason}") } // Or observe progress: // handle.state.collect { println(it) } // Queued → Sent → Acked/Delivered/Failed } ``` To **observe NodeDB changes** alongside sending, run the collector in its own coroutine so it doesn't block the rest of your flow. `client.nodes` never completes — collect it from a `launch { … }` (or use `take(N)` for a bounded sample): ```kotlin import kotlinx.coroutines.coroutineScope import kotlinx.coroutines.launch import org.meshtastic.sdk.NodeChange import org.meshtastic.sdk.RadioClient suspend fun observeAndSend(client: RadioClient) = coroutineScope { val nodesJob = launch { client.nodes.collect { change -> when (change) { is NodeChange.Snapshot -> println("seeded with ${change.nodes.size} nodes") is NodeChange.Added -> println("+ ${change.node.user?.long_name}") is NodeChange.Updated -> println("~ ${change.node.user?.long_name} (${change.changed})") is NodeChange.Removed -> println("- ${change.nodeId}") is NodeChange.WentOffline -> println("⊘ ${change.nodeId} offline") is NodeChange.CameOnline -> println("● ${change.nodeId} online") } } } client.sendText("hello mesh").await() // not blocked by the collector nodesJob.cancel() // stop observing when you're done } ``` Notes: - Wire-generated proto fields are snake_case (e.g. `user.long_name`, not `user.longName`). - **On Android**, also set `AndroidContextHolder.context = applicationContext` once in your `Application.onCreate()` before constructing a `SqlDelightStorageProvider` — see the [integration guide](docs/integration-guide.md#5-storage-on-android). - For Android BLE, USB-serial setup, and `SqlDelightStorageProvider` Android `Context` wiring, see the [integration guide](docs/integration-guide.md). ### Picking a transport The example above wires `TcpTransport`. The other two transports plug in identically — only the `Builder.transport(...)` line changes. Each ships in its own artifact; pull in the one(s) you need. ```kotlin // BLE — multiplatform (Android / iOS / JVM-desktop via Kable). // Android: see AndroidManifest checklist + permission notes in the integration guide. import androidx.activity.ComponentActivity import androidx.activity.result.contract.ActivityResultContracts import com.juul.kable.Peripheral import com.juul.kable.Scanner import kotlinx.coroutines.flow.first import kotlinx.coroutines.launch import org.meshtastic.sdk.transport.ble.BleTransport import org.meshtastic.sdk.storage.sqldelight.SqlDelightStorageProvider import org.meshtastic.sdk.RadioClient class BleQuickStartActivity : ComponentActivity() { private val permissions = registerForActivityResult( ActivityResultContracts.RequestMultiplePermissions(), ) { granted -> if (granted.values.all { it }) lifecycleScope.launch { connect() } } override fun onStart() { super.onStart() permissions.launch(arrayOf( android.Manifest.permission.BLUETOOTH_SCAN, android.Manifest.permission.BLUETOOTH_CONNECT, )) } private suspend fun connect() { // Filter by the Meshtastic GATT service UUID in real code. val ad = Scanner().advertisements.first() val client = RadioClient.Builder() .transport(BleTransport(Peripheral(ad), address = ad.identifier.toString())) .storage(SqlDelightStorageProvider(baseDir = filesDir.absolutePath)) .build() client.connect() client.events.collect { println(it) } } } ``` Full BLE setup (manifest entries, foreground service for API 34+, iOS `Info.plist` keys, JVM/desktop notes) is in the [Android setup checklist](docs/integration-guide.md#android-setup-checklist) and the per-transport [BLE section](docs/integration-guide.md#ble) of the integration guide. ### If your first send doesn't work, check | Symptom | Likely cause | Fix | |---|---|---| | `connect()` throws `MeshtasticException.TransportFailure` on TCP | Host unreachable or firmware TCP API disabled | Verify the radio's IP/hostname and that WiFi/Ethernet is enabled. See [TCP setup](docs/integration-guide.md#tcp). | | `connect()` hangs or fails repeatedly on BLE | Device not bonded with the OS | Pair the radio in your OS Bluetooth settings before `connect()`. See [BLE platform requirements](docs/integration-guide.md#ble). | | `JvmSerialPorts.open(...)` throws permission denied | Serial device permission not granted | On Linux, add the user to `dialout`. On Android, request USB permission first. See [Serial (USB)](docs/integration-guide.md#serial-usb). | | `sendText` returns `SendFailure` immediately on long messages | Payload exceeds the SDK-enforced 233-byte payload limit (`DATA_PAYLOAD_LEN`) | Split the text or send a smaller payload. See [Sending messages](docs/integration-guide.md#7-sending-messages). | | `connect()` throws `MeshtasticException.HandshakeTimeout` | `want_config_id` reply never arrived from the device | Power-cycle the radio, verify firmware ≥ 2.3, then retry. See [Build a `RadioClient`](docs/integration-guide.md#3-build-a-radioclient). | ```kotlin // USB-serial — JVM (jSerialComm) and Android (usb-serial-for-android) import org.meshtastic.sdk.transport.serial.JvmSerialPorts // androidMain: AndroidSerialPorts val portName = JvmSerialPorts.list().first() // e.g. "/dev/tty.usbserial-1410" val transport = JvmSerialPorts.open(portName, baudRate = 115200) ``` ```kotlin // TCP / WiFi — all targets import org.meshtastic.sdk.transport.tcp.TcpTransport val transport = TcpTransport(host = "meshtastic.local", port = 4403) ``` Full per-platform setup (Android runtime permissions, foreground-service requirements on API 34+, USB intent filters, iOS `Info.plist` keys) is in the [integration guide](docs/integration-guide.md). For lifecycle, DI, and R8 patterns see the [consumer guides index](docs/consumer-guides/README.md). Full API reference: [`docs/api-reference.md`](docs/api-reference.md). ## Targets All published modules target the same Kotlin Multiplatform target set via the shared `meshtastic.kmp.library` convention plugin: `jvm`, `androidTarget` (`minSdk = 26`), `iosArm64`, `iosX64`, and `iosSimulatorArm64`. Per-module behaviour is summarised below; see [`docs/architecture/module-graph.md`](docs/architecture/module-graph.md) for the authoritative dependency graph. ### Platform support matrix | Module | JVM | Android (`minSdk 26`) | iOS Arm64 | iOS Sim Arm64 | iOS X64 | Notes | |----------------------------|:---:|:---------------------:|:---------:|:-------------:|:-------:|-----------------------------------------------------------------------| | `core` | ✓ | ✓ | ✓ | ✓ | ✓ | Pure-Kotlin engine; re-exports the `org.meshtastic:protobufs` types (no other deps). | | `transport-ble` | ✓¹ | ✓ | ✓ | ✓ | ✓ | ¹ JVM uses `BlueZ`/`BleZ`-style adapter where available; see module README. | | `transport-tcp` | ✓ | ✓ | ✓ | ✓ | ✓ | Built on Ktor sockets. | | `transport-serial` | ✓ | ✓ | — | — | — | iOS targets compile (empty actuals) but no USB-serial API on iOS. | | `storage-sqldelight` | ✓ | ✓ | ✓ | ✓ | ✓ | SQLDelight native driver on iOS, JDBC on JVM/Android. | | `testing` | ✓ | ✓ | ✓ | ✓ | ✓ | In-memory fakes + `TestClock`; safe to use in `commonTest`. | ✓ = supported and exercised in CI; — = not applicable (no platform API for this transport). `wasmJs` (browser) remains on the post-1.0 roadmap — see [`docs/future/wasm-rpc-roadmap.md`](docs/future/wasm-rpc-roadmap.md). ## Documentation - **[`docs/SPEC.md`](docs/SPEC.md)** — master implementation plan (mission, scope, phases, locked defaults). - **[`docs/protocol.md`](docs/protocol.md)** — wire-level protocol bible (PhoneAPI, MeshPacket, channel encryption, MQTT proxy, …). - **[`docs/api-reference.md`](docs/api-reference.md)** — full public Kotlin signatures with KDoc. - **[`docs/error-taxonomy.md`](docs/error-taxonomy.md)** — what throws, what returns `AdminResult`, what surfaces as `MeshEvent`. - **[`docs/glossary.md`](docs/glossary.md)** — vocabulary (NodeNum vs NodeId, request_id vs packet_id, channel hash, …). - **[`docs/architecture/`](docs/architecture/)** — handshake FSM, engine actor dataflow, storage, module dependency graph (Mermaid diagrams). - **[`docs/consumer-guides/`](docs/consumer-guides/)** — host-app integration recipes (reactive lifecycle, Hilt, MVVM, R8/Proguard). - **[`docs/decisions/`](docs/decisions/)** — ADRs (charter, API shape, tooling, licensing, multi-module rationale). - **[`docs/roadmap.md`](docs/roadmap.md)** — Phase 2 / Phase 3 deferred items (stubs, no-ops, missing observables). - **[`docs/versioning.md`](docs/versioning.md)** — SemVer + ABI policy. - **[`docs/security.md`](docs/security.md)** — threat model + scope. - **[`docs/manual-tests.md`](docs/manual-tests.md)** — device-conformance suite (CI cannot run these). - **[`docs/ci-cd.md`](docs/ci-cd.md)** — GitHub Actions workflows. - **[`docs/samples.md`](docs/samples.md)** — what each `samples/*` demonstrates. ## Building from source ```bash git clone git@github.com:meshtastic/meshtastic-sdk.git cd meshtastic-sdk ./gradlew check # build + test + lint + checkKotlinAbi + detekt + :core:verifyModuleBoundary ``` Requirements: - JDK 21 (`sdk install java 21-tem`). - Android SDK with API 36 platform if building Android targets (set `ANDROID_HOME`). - Xcode + iOS 14+ SDK if building iOS targets (mac only). ### Runtime requirements (consumers) - **Android API 26+ (Android 8.0 Oreo).** All `sdk-*` Android artifacts pin `minSdk = 26`. Apps with `minSdk < 26` will fail to resolve the dependency at build time, and reflection-based loaders on older OS versions will fail at runtime — there is no graceful fallback. See the [Android setup checklist](docs/integration-guide.md#android-setup-checklist). - **iOS 14+** for the BLE/TCP transports. - **JDK 17+** runtime for JVM consumers (bytecode is JDK 17, toolchain is JDK 21). Local commands: see [`docs/ci-cd.md`](docs/ci-cd.md#local-equivalents). ## Contributing We use the Developer Certificate of Origin (DCO). Sign every commit: ```bash git commit -s -m "Your message" ``` See [`CONTRIBUTING.md`](CONTRIBUTING.md) for the full flow. ## License GPL-3.0-or-later. See [`LICENSE`](LICENSE) and [`docs/decisions/004-licensing.md`](docs/decisions/004-licensing.md). ## Related Meshtastic projects - [`meshtastic/firmware`](https://github.com/meshtastic/firmware) — device-side reference (read-only behavior anchor here). - [`meshtastic/protobufs`](https://github.com/meshtastic/protobufs) — wire schema; consumed as the published `org.meshtastic:protobufs` artifact. - [`meshtastic/Meshtastic-Android`](https://github.com/meshtastic/Meshtastic-Android), [`meshtastic/Meshtastic-Apple`](https://github.com/meshtastic/Meshtastic-Apple) — flagship apps; cross-validation references. - [`meshtastic/mqtt-client`](https://github.com/meshtastic/mqtt-client) — sibling KMP library for direct MQTT broker use.

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