csi_entry =
timestamp_low: 4
bfee_count: 72
Nrx: 3
Ntx: 1
rssi_a: 33
rssi_b: 37
rssi_b: 37
noise: -127
agc: 38
perm: [3 2 1]
rate: 256
csi: [1x3x30 double]
timestamp_low: timestamp_low is the low 32 bits of the NIC's 1 MHz clock. It wraps about every 4300 seconds, or 72 minutes。一个时间戳