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fix(firmware): upgrade NimBLE to 2.x + DNS fallback for unreliable resolvers

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NimBLE-Arduino 1.4.2 had an init/fire race in its FreeRTOS callout porting
layer where os_callout_timer_cb dispatched a queued TimerHandle expiry
against a not-yet-initialized event (NULL fn pointer), causing PC=0
InstrFetchProhibited within ~1s of boot when the camera task starved the
timer service. Confirmed by ets_printf instrumentation. Upgrading to
^2.0.0 rewrites the porting layer and eliminates the race; verified clean
on the customer network for 1+ hour.

Also rolls in DNS-resilience work that surfaced the BLE crash during
provisioning: pin lwIP/esp-netif resolvers to 1.1.1.1/8.8.8.8 across DHCP
renewals, add three-tier resolver fallback in reporter with a hardcoded
IP of last resort, and switch to raw WiFiClient with manual Host header
to bypass HTTPClient's brittle DNS path.

Migration touches for NimBLE 2.x:
- NimBLEAdvertisedDeviceCallbacks -> NimBLEScanCallbacks
- onResult signature now takes const NimBLEAdvertisedDevice*
- setAdvertisedDeviceCallbacks -> setScanCallbacks
- start(0, nullptr, false) -> start(0, false, false)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Peter Woolery
2026-05-01 11:34:17 -07:00
parent 461ed7d888
commit a585a56cff
9 changed files with 1434 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
firmware/src/ble_scanner.cpp
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@@ -42,8 +42,8 @@ static String sha256_prefix(const String& input) {
return hex;
}
class ScanCallback : public NimBLEAdvertisedDeviceCallbacks {
void onResult(NimBLEAdvertisedDevice* dev) override {
class ScanCallback : public NimBLEScanCallbacks {
void onResult(const NimBLEAdvertisedDevice* dev) override {
String mac = String(dev->getAddress().toString().c_str());
String hash = sha256_prefix(mac);
int rssi = dev->getRSSI();
@@ -51,7 +51,6 @@ class ScanCallback : public NimBLEAdvertisedDeviceCallbacks {
std::lock_guard<std::mutex> lock(s_mutex);
auto it = s_seen.find(hash);
if (it == s_seen.end()) {
Serial.printf("[BLE] new device: %s (rssi %d)\n", hash.c_str(), rssi);
s_seen[hash] = {rssi, 1};
} else {
it->second.rssi_sum += rssi;
@@ -68,16 +67,16 @@ static NimBLEScan* s_scan = nullptr;
void ble_scanner_start() {
NimBLEDevice::init("");
s_scan = NimBLEDevice::getScan();
s_scan->setAdvertisedDeviceCallbacks(&s_callback, true); // true = allow duplicates
s_scan->setScanCallbacks(&s_callback, true); // true = allow duplicates
s_scan->setActiveScan(false); // passive
s_scan->setInterval(100);
s_scan->setWindow(99);
s_scan->setMaxResults(0); // don't store results — callback-only
s_scan->start(0, nullptr, false); // 0 = continuous
s_scan->start(0, false, false); // duration=0 (forever), isContinue=false, restart=false
}
void ble_scanner_pause() { if (s_scan) s_scan->stop(); }
void ble_scanner_resume() { if (s_scan) s_scan->start(0, nullptr, false); }
void ble_scanner_resume() { if (s_scan) s_scan->start(0, false, false); }
void ble_scanner_deinit() {
if (s_scan) s_scan->stop();