Advanced Connectivity Layer

Status (v1.6.5):

Protocol Status Notes

AkiraMesh Implemented AODV routing, E2E crypto, BLE + 802.15.4 transports, mesh_* WASM API. CONFIG_AKIRA_MESH is n by default. Mesh app distribution returns -ENOSYS.

Matter Partial The accessory / device-as-endpoint path works over the co-processor IPC bridge. The non-accessory path returns -ENOSYS — it needs the CHIP SDK, which is not vendored.

Thread Stubbed (-ENOSYS) Requires OpenThread, which is not integrated.

AkiraSync Planned CONFIG_AKIRA_SYNC_* and capability bit 39 exist, but src/connectivity/sync/ is not compiled and registers no natives.

These require additional west.yml modules and are not enabled in the default prj.conf. Standard WiFi and BLE connectivity is documented in Connectivity Layer.

Protocol	Status	Notes
AkiraMesh	Implemented	AODV routing, E2E crypto, BLE + 802.15.4 transports, `mesh_` WASM API. `CONFIG_AKIRA_MESH` is `n` by default. Mesh app distribution* returns `-ENOSYS`.
Matter	Partial	The accessory / device-as-endpoint path works over the co-processor IPC bridge. The non-accessory path returns `-ENOSYS` — it needs the CHIP SDK, which is not vendored.
Thread	Stubbed (`-ENOSYS`)	Requires OpenThread, which is not integrated.
AkiraSync	Planned	`CONFIG_AKIRA_SYNC_*` and capability bit 39 exist, but `src/connectivity/sync/` is not compiled and registers no natives.

Hardware-agnostic implementation of Matter, Thread, and AkiraMesh protocols for AkiraOS.

Architecture Overview

The Advanced Connectivity Layer introduces a Radio Abstraction Layer (RAL) that decouples protocol stacks from physical radio hardware, enabling protocols to work across all supported platforms (ESP32-S3, nRF54L15, and future devices).

┌─────────────────────────────────────────────────────────────┐
│                    Protocol Layer                           │
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐        │
│  │   Matter    │  │   Thread    │  │  AkiraMesh  │        │
│  └──────┬──────┘  └──────┬──────┘  └──────┬──────┘        │
│         │                 │                 │                │
│         └─────────────────┴─────────────────┘                │
└─────────────────────────────────────┬───────────────────────┘
                                      │
┌─────────────────────────────────────┴───────────────────────┐
│              Radio Abstraction Layer (RAL)                  │
│  ┌─────────────┐  ┌─────────────┐  ┌─────────────┐        │
│  │  WiFi Radio │  │  BLE Radio  │  │ 802.15.4 R. │        │
│  └──────┬──────┘  └──────┬──────┘  └──────┬──────┘        │
└─────────┴────────────────┴────────────────┴────────────────┘
          │                 │                 │
┌─────────┴────────────────┴────────────────┴────────────────┐
│                    Hardware Layer                           │
│   ESP32 WiFi      ESP32 BLE      nRF54L15 802.15.4        │
└─────────────────────────────────────────────────────────────┘

Components

1. Radio Abstraction Layer (RAL)

Location: src/connectivity/radio/, include/connectivity/radio_interface.h

Provides unified interface to all radio hardware with:

Runtime capability discovery - Query what each radio supports
Zero-copy operations - Direct buffer management where possible
Thread-safe access - Concurrent protocol usage of different radios
Event-driven model - Callbacks for RX, TX complete, scan results

Radio Backends:

radio_wifi.c - IEEE 802.11 WiFi (ESP32, nRF7002)
radio_ble.c - Bluetooth Low Energy 5.x
radio_802154.c - IEEE 802.15.4 (nRF54L15, CC2520)

2. Matter Protocol Stack

Location: src/connectivity/matter/, include/connectivity/matter_manager.h

Matter (Connected Home over IP) protocol support with:

Multi-transport support - WiFi, Thread, BLE commissioning
QR code / manual pairing code generation
Device commissioning - BLE and soft-AP flows
OTA updates - Matter OTA requestor/provider
Cluster attributes - Simplified API for WASM apps

Configuration:

CONFIG_AKIRA_MATTER=y
CONFIG_AKIRA_MATTER_VENDOR_ID=0xFFF1
CONFIG_AKIRA_MATTER_PRODUCT_ID=0x8000
CONFIG_AKIRA_MATTER_DEVICE_TYPE=0x0100  # On/Off Light

Note: Full implementation requires adding ConnectedHomeOverIP module to west.yml:

- name: matter
  url: https://github.com/project-chip/connectedhomeip
  revision: v1.3.0.0
  import: true

3. Thread Protocol Stack

Location: src/connectivity/thread/, include/connectivity/thread_manager.h

OpenThread mesh networking with:

Network formation - Leader election, router/end device roles
Commissioning - Thread joiner/commissioner protocols
Border router - Gateway to WiFi/Ethernet (optional)
IPv6 addressing - RLOC, EID, mesh-local, global addresses

Configuration:

CONFIG_AKIRA_THREAD=y
CONFIG_AKIRA_THREAD_FTD=y  # Full Thread Device (router capable)
CONFIG_AKIRA_THREAD_BORDER_ROUTER=n  # Enable for gateway functionality

Note: Requires OpenThread module in west.yml:

- name: openthread
  url: https://github.com/openthread/openthread
  revision: thread-reference-20240710
  import: true

4. AkiraMesh Protocol

Location: src/connectivity/mesh/, include/connectivity/akira_mesh.h

Custom lightweight mesh networking with:

Multi-transport - BLE Mesh, 802.15.4, ESP-NOW (ESP32)
Multi-hop routing - AODV-based route discovery
WASM app distribution - Chunked transfer across mesh
State synchronization - Shared state between nodes

Configuration:

CONFIG_AKIRA_MESH=y
CONFIG_AKIRA_MESH_MAX_NODES=32
CONFIG_AKIRA_MESH_MAX_HOPS=5
CONFIG_AKIRA_MESH_TRANSPORT_BLE=y
CONFIG_AKIRA_MESH_TRANSPORT_802154=y

Protocol Features:

Node discovery - Periodic beacon broadcasts
Automatic routing - Route discovery/maintenance
Mesh OTA - Distribute WASM apps to all nodes
Low overhead - Minimal header (21 bytes: version, msg_type, ttl, src_id[8], dest_id[8], seq_num)

Shell Commands

Radio Manager

radio info           # List available radios and capabilities
radio stats <type>   # Show radio statistics (wifi|ble|802154)

Matter

matter info          # Show Matter status
matter commission    # Start commissioning (displays QR code)
matter reset         # Factory reset

Thread

thread info          # Show Thread network status
thread start         # Start Thread networking
thread stop          # Stop Thread network

AkiraMesh

mesh info            # Show mesh statistics
mesh nodes           # List discovered nodes
mesh start           # Start mesh networking
mesh stop            # Stop mesh

Hardware Platform Support

Platform	WiFi	BLE	802.15.4	Matter	Thread	AkiraMesh
ESP32-S3	Yes	Yes	No	Yes (WiFi transport)	No	Yes (BLE)
nRF54L15	No	Yes	Yes	Yes (Thread transport)	Yes	Yes (BLE + 802.15.4)
native_sim	No	Simulated	No	No	No	Simulated

Usage Examples

Initialize Radio Manager

#include "connectivity/radio_interface.h"

// Radio manager initializes automatically at boot
// Query available radios:
radio_handle_t *wifi = radio_manager_get(RADIO_TYPE_WIFI);
if (wifi) {
    radio_stats_t stats;
    radio_get_stats(wifi, &stats);
    printk("WiFi RSSI: %d dBm\n", stats.rssi);
}

Matter Device Setup

#include "connectivity/matter_manager.h"

// Configure Matter device
matter_config_t config = {
    .vendor_id = 0xFFF1,
    .product_id = 0x8000,
    .device_type = MATTER_DEVICE_TYPE_LIGHT,
    .transport = MATTER_TRANSPORT_WIFI,  // or MATTER_TRANSPORT_THREAD
    .discriminator = 3840,
    .setup_pin_code = 20202021,
};
strcpy(config.device_name, "Akira Light");
strcpy(config.serial_number, "AK-001");

matter_manager_init(&config);

// Start commissioning
matter_start_commissioning(300);  // 5 minute window

// Get QR code for easy pairing
char qr[128];
matter_get_qr_code(qr, sizeof(qr));
printk("Scan this: %s\n", qr);

Thread Network Formation

#include "connectivity/thread_manager.h"

// Configure Thread network
thread_config_t config = {
    .panid = 0x1234,
    .channel = 15,
    .is_ftd = true,  // Full Thread Device
    .enable_border_router = false,
};
strcpy(config.network_name, "AkiraNet");

thread_manager_init(&config);
thread_start();

// Network will automatically form or join

AkiraMesh Node

#include "connectivity/akira_mesh.h"

// Configure mesh node
akira_mesh_config_t config = {
    .role = AKIRA_MESH_ROLE_NODE,
    .transport = AKIRA_MESH_TRANSPORT_BLE,
    .max_hops = 5,
    .enable_auto_routing = true,
};
memcpy(config.node_id, my_node_id, 8);
strcpy(config.node_name, "Akira-001");

akira_mesh_init(&config);
akira_mesh_start();

// Send data to another node
akira_mesh_send(dest_node_id, data, len);

// Broadcast to all nodes
akira_mesh_broadcast(announcement, size, 3);  // Max 3 hops

Integration with Existing Systems

OTA Updates

All three protocols integrate with the existing OTA manager through the generic transport interface:

Matter: Matter OTA cluster routes to OTA manager via transport interface
Thread: Thread multicast routes to OTA manager via transport interface
AkiraMesh: Chunk-based transfer routes to OTA manager via akira_mesh_distribute_app()

Note: Protocol-specific OTA transport adapters (ota_matter.c, ota_thread.c, ota_mesh.c) are planned for future implementation. Current OTA transports: BLE, HTTP, Cloud, USB.

WASM Native API

Protocol integration with WASM applications is planned:

Matter cluster attribute access (planned)
Thread IPv6 socket operations (planned)
AkiraMesh send/broadcast operations (planned)

Note: WASM native API bindings for advanced connectivity protocols are under development. Currently available transports use existing network APIs.

Transport Interface

Radio layer integrates with existing transport_interface.c:

// Register RAL as transport source
transport_register_handler(TRANSPORT_DATA_FIRMWARE, 
                          radio_firmware_handler, NULL, 10);

Performance Characteristics

Radio Abstraction Layer

Overhead: <100 bytes per radio handle
Latency: <1ms function call overhead
Memory: ~2KB total (all backends)

Matter

Flash: ~200KB (with CHIP SDK)
RAM: ~50KB runtime
Commissioning: 10-30 seconds typical

Thread

Flash: ~150KB (with OpenThread)
RAM: ~30KB runtime
Network formation: 5-15 seconds

AkiraMesh

Flash: ~15KB
RAM: ~4KB + (nodes × 80 bytes)
Discovery: <5 seconds for 10 nodes
Hop latency: ~20ms per hop (BLE), ~5ms (802.15.4)

Troubleshooting

Radio Not Available

ERROR: WiFi radio not available for Matter transport

Solution: Check that WiFi is enabled in prj.conf:

CONFIG_WIFI=y
CONFIG_WIFI_ESP32=y

Matter Commissioning Fails

ERROR: Matter commissioning timeout

Solution: Ensure BLE is working and check discriminator/PIN:

matter info  # Verify state
bt info      # Check BLE status

Thread Won’t Form Network

ERROR: Thread network formation failed

Solution: Verify 802.15.4 radio and channel:

radio stats 802154
thread info

Mesh Nodes Not Discovered

Solution: Check beacon transmission:

mesh info  # Verify messages_sent > 0
radio stats ble  # Check TX packets

License

Last updated: 2026-09-14 (AkiraOS v1.6.5)