Hi,
I'm working on an nRF5340 + nRF7002 project using Zephyr RTOS, where the device enters low-power sleep and wakes up on a hardware counter alarm (counter_set_channel_alarm()). The wake-up flow initializes data collection, sensor reading, and reconnects Wi-Fi to upload data.
The initial wake-up and data flow works well — the alarm triggers, Wi-Fi reconnects successfully, and sensors initialize correctly. However, after a short time (around 1–2 minutes), I start seeing these repeated warnings and errors:
<wrn> net_conn: pkt cloning failed, pkt 0x2006269c dropped
<err> net_pkt: Data buffer (526) allocation failed.
<inf> nrf7002_wifi: DNS resolution failed, Wi-Fi might be down.
<inf> nrf7002_wifi: NET_EVENT_WIFI_DISCONNECT_RESULT
Eventually, Wi-Fi disconnects entirely. I suspect this may be due to packet buffer exhaustion (net_pkt / net_buf) or improper memory cleanup.
️ System Details:
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nRF Connect SDK version: V2.6.2
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Board: nRF5340 DK + nRF7002 EK
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Features: Wi-Fi STA mode, NVS storage, custom sensor drivers, counter-based alarm wake-up
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Power Mode: k_cpu_idle
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Alarm Set With:
counter_set_channel_alarm()
Questions:
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What might be causing the net_pkt buffer exhaustion — are there known leaks or missing unrefs in the Wi-Fi subsystem?
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Are there recommended
CONFIG_NET_PKT_*orCONFIG_NET_BUF_*settings for nRF7002 with moderate periodic Wi-Fi usage? -
How can I profile or debug net_pkt allocation usage more effectively post-wake-up?
proj config file for ur reference
3884.prj.conf
