Add BLE Wi-Fi provisioning alongside the setup SoftAP
Wraps ESP-IDF's official wifi_provisioning manager (BLE transport, protocomm Security1, NimBLE host) so a phone can join the device to Wi-Fi over the ESP32-S3's own onboard BLE radio, without first connecting to the 192.168.4.1 SoftAP. Chosen over a custom GATT service specifically so the existing generic "ESP BLE Provisioning" iOS/Android apps work today, before the dedicated DigiRadio app exists — same standard protocol either app would speak. net::ble_provisioning::start() is additive, not a replacement: it runs next to the current SoftAP + POST /api/wifi HTTP route inside NetBootstrap's startSetupMode(), and failing to start it is non-fatal (same pattern already used there for the SigmaStudio TCP bridge) — SoftAP setup keeps working either way. Proof-of-possession is the device's own serial number (same source as the SoftAP SSID), so pairing requires reading it off the unit rather than being wide open. On WIFI_PROV_CRED_SUCCESS the received wifi_sta_config_t is converted to the same core::WifiCredentials type the HTTP handler uses and saved through the same ISecureStore, then the device reboots into STA mode — one persistence path regardless of which transport provisioned it. BT1035 is unaffected: it's a separate UART-attached classic Bluetooth module for A2DP output. This uses the ESP32-S3's independent internal BLE controller, switched to NimBLE (smaller footprint than Bluedroid, the only host stack needed for a single peripheral-role GATT service). App binary still has 33% free flash after pulling in wifi_provisioning/protocomm/NimBLE. Verified: idf.py build, doxygen (0 warnings), check-manual-sync, check_si4684_blobs, ctest (19/19) all green. Not yet tested with a real BLE provisioning app or on hardware — board is disconnected this session. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0178rASQ6ZETPMUamvpoR2KR
This commit is contained in:
Claude Sonnet 5
@@ -7,9 +7,10 @@ idf_component_register(
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"src/SigmaStudioTcpServer.cpp"
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"src/WifiScanner.cpp"
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"src/NetBootstrap.cpp"
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"src/BleProvisioning.cpp"
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INCLUDE_DIRS "include"
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EMBED_FILES "www/index.html.gz"
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REQUIRES core esp_wifi esp_netif esp_event nvs_flash esp_http_server mdns lwip secure_store tuner audio bluetooth station integration ota bt1035 adau1701 webradio
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REQUIRES core esp_wifi esp_netif esp_event nvs_flash esp_http_server mdns lwip secure_store tuner audio bluetooth station integration ota bt1035 adau1701 webradio wifi_provisioning
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)
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target_compile_features(${COMPONENT_LIB} PUBLIC cxx_std_23)
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@@ -0,0 +1,50 @@
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/**
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* @file BleProvisioning.hpp
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* @brief BLE GATT Wi-Fi provisioning, additive alongside the setup SoftAP.
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*
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* DigiRadio firmware — https://github.com/manvalan/DigiRadio
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*
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* Copyright 2026 Michele Bigi
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* @author Michele Bigi
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* @date 2026-08-18
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*/
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#pragma once
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#include "core/DeviceIdentity.hpp"
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#include "core/ISecureStore.hpp"
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#include "net/NetError.hpp"
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#include <expected>
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namespace net::ble_provisioning {
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/**
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* @brief start — start the ESP-IDF wifi_provisioning manager over BLE.
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*
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* @dname start
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* @param store Secure store the received credentials are saved
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* to (same store POST /api/wifi writes to).
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* @param deviceIdentity Supplies the BLE advertising name (softApSsid)
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* and the proof-of-possession string (serialNumber).
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* @return Ok once provisioning is advertising, or NetError::BleProvisioningFailed.
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* @pubstate Starts the onboard ESP32-S3 BLE radio (independent of the BT1035
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* UART module) and a process-lifetime wifi_provisioning manager
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* singleton. On a successful join, saves credentials to store and
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* reboots, mirroring wifiPostHandler's POST /api/wifi behaviour.
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* Runs alongside the existing SoftAP + HTTP provisioning route,
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* not instead of it — either path can complete setup.
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*
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* @author Michele Bigi
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* @date 2026-08-18
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*/
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[[nodiscard]] std::expected<void, NetError>
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start(core::ISecureStore& store, const core::DeviceIdentity& deviceIdentity);
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} // namespace net::ble_provisioning
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@@ -43,6 +43,7 @@ enum class NetError {
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StoreSaveFailed,
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CredentialsNotFound,
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WifiScanFailed,
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BleProvisioningFailed,
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};
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} // namespace net
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@@ -0,0 +1,159 @@
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/**
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* @file BleProvisioning.cpp
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* @brief BleProvisioning implementation.
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*
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* DigiRadio firmware — https://github.com/manvalan/DigiRadio
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*
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* Copyright 2026 Michele Bigi
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* @author Michele Bigi
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* @date 2026-08-18
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*/
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#include "net/BleProvisioning.hpp"
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#include "core/Secret.hpp"
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#include "core/WifiCredentials.hpp"
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#include "core/WifiSsid.hpp"
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#include "esp_log.h"
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#include "esp_wifi_types.h"
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "wifi_provisioning/manager.h"
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#include "wifi_provisioning/scheme_ble.h"
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#include <cstring>
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#include <optional>
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#include <string>
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namespace net::ble_provisioning {
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namespace {
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constexpr char kTag[] = "BleProvisioning";
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constexpr unsigned kRebootDelaySec = 3;
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// wifi_prov_mgr_init's callback is a plain C function pointer, so the store
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// and the credentials received mid-handshake are kept in module statics —
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// this mirrors the manager's own singleton lifetime (one instance for the
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// life of the process, same as NetBootstrap's other network resources).
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core::ISecureStore* gStore = nullptr;
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std::optional<wifi_sta_config_t> gPendingCreds;
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void rebootTask(void* arg)
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{
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(void)arg;
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vTaskDelay(pdMS_TO_TICKS(kRebootDelaySec * 1000));
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esp_restart();
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}
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/** wifi_sta_config_t::ssid/password are fixed-size byte arrays, zero-padded
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* but not guaranteed null-terminated when exactly full length. */
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[[nodiscard]] std::string_view boundedView(const std::uint8_t* bytes,
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std::size_t maxLen) noexcept
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{
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const auto* chars = reinterpret_cast<const char*>(bytes);
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return std::string_view(chars, strnlen(chars, maxLen));
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}
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void saveAndReboot()
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{
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if (gStore == nullptr || !gPendingCreds.has_value()) {
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ESP_LOGW(kTag, "credentials success event with no pending creds — "
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"not saving");
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return;
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}
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const auto& cfg = *gPendingCreds;
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const std::string_view ssidRaw =
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boundedView(cfg.ssid, sizeof(cfg.ssid));
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const std::string_view passwordRaw =
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boundedView(cfg.password, sizeof(cfg.password));
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if (!core::WifiSsid::isValid(ssidRaw) ||
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!core::WifiCredentials::isPasswordValid(passwordRaw)) {
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ESP_LOGW(kTag, "BLE-provisioned credentials failed local validation "
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"— not saving");
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return;
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}
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const core::WifiCredentials creds{core::WifiSsid(ssidRaw),
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core::Secret(std::string(passwordRaw))};
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if (!gStore->saveWifiCredentials(creds)) {
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ESP_LOGE(kTag, "failed to persist BLE-provisioned credentials");
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return;
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}
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ESP_LOGI(kTag, "Wi-Fi joined via BLE provisioning — rebooting into STA");
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xTaskCreate(rebootTask, "ble_prov_reboot", 2048, nullptr, 5, nullptr);
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}
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void provEventHandler(void* /*user_data*/, wifi_prov_cb_event_t event,
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void* data)
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{
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switch (event) {
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case WIFI_PROV_CRED_RECV:
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if (data != nullptr) {
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gPendingCreds = *static_cast<const wifi_sta_config_t*>(data);
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ESP_LOGI(kTag, "credentials received over BLE");
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}
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break;
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case WIFI_PROV_CRED_FAIL:
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ESP_LOGW(kTag, "BLE-provisioned Wi-Fi join failed — waiting for "
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"the app to retry");
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gPendingCreds.reset();
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break;
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case WIFI_PROV_CRED_SUCCESS:
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saveAndReboot();
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break;
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default:
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break;
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}
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}
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} // namespace
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std::expected<void, NetError>
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start(core::ISecureStore& store, const core::DeviceIdentity& deviceIdentity)
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{
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gStore = &store;
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gPendingCreds.reset();
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// Copies kept for the lifetime of provisioning: wifi_prov_mgr_start_
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// provisioning only borrows these pointers, it does not take ownership.
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static const std::string serviceName(deviceIdentity.softApSsid());
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static const std::string pop(deviceIdentity.serialNumber());
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const wifi_prov_mgr_config_t config{
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.scheme = wifi_prov_scheme_ble,
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.scheme_event_handler = WIFI_PROV_SCHEME_BLE_EVENT_HANDLER_FREE_BTDM,
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.app_event_handler = {.event_cb = provEventHandler,
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.user_data = nullptr},
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};
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if (wifi_prov_mgr_init(config) != ESP_OK) {
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ESP_LOGE(kTag, "wifi_prov_mgr_init failed");
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return std::unexpected(NetError::BleProvisioningFailed);
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}
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if (wifi_prov_mgr_start_provisioning(WIFI_PROV_SECURITY_1, pop.c_str(),
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serviceName.c_str(),
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nullptr) != ESP_OK) {
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ESP_LOGE(kTag, "wifi_prov_mgr_start_provisioning failed");
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wifi_prov_mgr_deinit();
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return std::unexpected(NetError::BleProvisioningFailed);
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}
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ESP_LOGI(kTag,
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"BLE provisioning advertising as %s (proof-of-possession: "
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"device serial number)",
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serviceName.c_str());
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return {};
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}
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} // namespace net::ble_provisioning
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@@ -23,6 +23,7 @@
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#include "esp_netif.h"
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#include "esp_wifi.h"
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#include "audio/AudioService.hpp"
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#include "net/BleProvisioning.hpp"
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#include "bluetooth/BluetoothService.hpp"
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#include "secure_store/NvsPlatformInit.hpp"
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#include "station/StationService.hpp"
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@@ -131,6 +132,15 @@ startSetupMode(core::ISecureStore& store, tuner::TunerService& tuner,
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"without it");
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}
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// Additive: a phone can provision over BLE (no need to first join the
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// SoftAP) while the HTTP route above keeps working as before. Non-fatal
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// — setup mode is still fully usable via SoftAP if this fails.
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if (auto bleResult = ble_provisioning::start(store, deviceIdentity);
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!bleResult) {
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ESP_LOGW(kTag, "BLE provisioning failed to start — SoftAP setup "
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"still available");
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}
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ESP_LOGI(kTag, "setup mode ready — SSID %.*s",
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static_cast<int>(deviceIdentity.softApSsid().size()),
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deviceIdentity.softApSsid().data());
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@@ -28,3 +28,10 @@ CONFIG_COMPILER_CXX_STD=23
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CONFIG_LOG_DEFAULT_LEVEL_INFO=y
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CONFIG_ESPTOOLPY_FLASHSIZE_16MB=y
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CONFIG_ESP_MAIN_TASK_STACK_SIZE=8192
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# Onboard BLE for wifi_provisioning (net/BleProvisioning.cpp) — the ESP32-S3's
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# own radio, independent of the BT1035 UART module which stays classic-A2DP-only.
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# NimBLE instead of Bluedroid: smaller flash/RAM footprint, and the only host
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# stack this firmware needs is a single GATT peripheral role for provisioning.
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CONFIG_BT_ENABLED=y
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CONFIG_BT_NIMBLE_ENABLED=y
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