Hello,
I have recently switched to nrf52840 dongle for 802.15.4 sniffing.
I did a simple test with a ZigBee Green Power sensor sending data on channel 11. On the receiver side there is a dongle receiver which is sending acknowledge to sensor on channel 11.
I put this receiver on an USB hub and there is an nrf52840dongle sniffing channel 11 and and an nrf52840dongle sniffing channel 12 on both sides the the receiver. This means both sniffers are very near to the ack source.
Here is a Wireshark capture and you can see in white data from sensor and in yellow the ack from receiver.
The problem is that BOTH sniffer see the ack. I did not expect the sniffer on channel 12 to see the data from channel 11. This is something I have absolutely never experienced before.
If I'm correct, channels are 5MHz appart
I did some additional tests to put the sniffer further away from the source and I see that channel 12 sees data with only about 30 to 40dBm less than channel 11. I expected much better selectivity.
Can you please confirm if this is normal and explain the behavior ?
