ESP-NOW lost packets. Detect bad FCS RadioTap in Promiscuous?
Posted: Wed Jan 20, 2021 6:24 pm
I have an ESP-NOW (WiFi) project using ESP32-WROOM32 devices.
All packets are transmitted as BROADCAST WiFi packets in the ESP-NOW protocol. Every device should receive all packets. Packets are broadcast continually at a rate of > 3 packets per second.
However, sometimes a device will STOP receiving packets for many seconds. Other devices near it will work fine. Only that one device will stop receiving.
In Wireshark, I sometimes see RadioTap "Bad_FCS" packets (meaning the packet is corrupt). I am wondering if my device is dropping packets that have bad FCS.
Question: How can I detect a "bad_fcs" packet in promiscuous mode on the ESP32? I know how to capture promiscuous packets. I just need to know how to decode the radiotap header and data information.
Is there any documentation on reading radiotap information in promiscuous mode on the ESP32?
Thank you!
Phil.
All packets are transmitted as BROADCAST WiFi packets in the ESP-NOW protocol. Every device should receive all packets. Packets are broadcast continually at a rate of > 3 packets per second.
However, sometimes a device will STOP receiving packets for many seconds. Other devices near it will work fine. Only that one device will stop receiving.
In Wireshark, I sometimes see RadioTap "Bad_FCS" packets (meaning the packet is corrupt). I am wondering if my device is dropping packets that have bad FCS.
Question: How can I detect a "bad_fcs" packet in promiscuous mode on the ESP32? I know how to capture promiscuous packets. I just need to know how to decode the radiotap header and data information.
Is there any documentation on reading radiotap information in promiscuous mode on the ESP32?
Thank you!
Phil.