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Count and surface RX-queue drops on the ESP32-C5's promiscuous path

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wifi_promisc_rx_cb() fed s_rx_queue with a 0-timeout xQueueSend() and never
checked whether it succeeded, so a burst of captured frames arriving faster
than rx_forward_task could drain them vanished with no counter anywhere -
none of oversizeDrops/txFailures/rxCrcErrors caught it. Added a rxQueueDrops
counter, threaded it through the STATUS heartbeat as a new trailing uint16
(old firmware/app on either side still parse fine), and surfaced it on the
CAM Pinger card.

Confirmed on the bench: flashed to the production OBU (COM3) and installed
the matching app build on the phone, then watched the counter over logcat
against obu-cam-transmistter's ~3.3 Hz beacon - it is real (0 -> 89 -> 90
across two sessions) but bursty around connect/reconnect rather than a
continuous overflow under steady single-station traffic.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
This commit is contained in:
Ashin Walpola
2026-09-22 14:41:53 +02:00
co-authored by Claude Sonnet 5
parent 21e01499d8
commit 71dde3364d
9 changed files with 209 additions and 15 deletions
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obu-firmware/main/main.c
+7 -2
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@@ -259,8 +259,13 @@ static void wifi_promisc_rx_cb(void *recv_buf, wifi_promiscuous_pkt_type_t type)
s_cb_item.rssi = packet->rx_ctrl.rssi;
// 0 timeout: never block the WiFi driver's own task waiting for queue space. xQueueSend copies
// the struct out before returning, so reusing s_cb_item on the next callback is fine.
xQueueSend(s_rx_queue, &s_cb_item, 0);
// the struct out before returning, so reusing s_cb_item on the next callback is fine. The
// return value used to go unchecked, so a full queue (rx_forward_task still draining a
// previous burst) silently ate frames with no counter anywhere - see
// serial_link_note_rx_queue_drop()'s KDoc.
if (xQueueSend(s_rx_queue, &s_cb_item, 0) != pdTRUE) {
serial_link_note_rx_queue_drop();
}
}
static void rx_forward_task(void *arg)