Short answer

ESP32 light sleep drops Wi-Fi every time. Is that expected?

  • Light sleep can keep more state than deep sleep, but Wi-Fi still needs a defined power-save mode and wake budget.
  • If you tear down the radio each sleep, expect full re-associate cost. That is not a modem-sleep profile.
  • Measure current with the intended DTIM/listen interval. Lab DHCP renewals hide field drops.
  • Pick deep sleep for sparse telemetry; pick modem-sleep or light sleep only when the association must stay warm.

中文

短答

ESP32 浅睡每次都掉 Wi-Fi，正常吗？

  • 浅睡比深睡多保一些状态，但 Wi-Fi 仍要明确的省电模式和唤醒预算。
  • 若每次睡前拆掉射频，就要付重新关联的成本。那不是 modem-sleep。
  • 按目标 DTIM/监听间隔测电流。台上频繁 DHCP 会掩盖现场掉线。
  • 稀疏上报用深睡；必须保温关联时再用 modem-sleep 或浅睡。