If wirelessAPBasicRateChoice is set to auto(0), then the
value in this object should be empty.
oneM means 1Mbps,
twoM means 2Mbps,
fiveDotfiveM means 5.5Mbps,
elevenM means 11Mbps
This object won't be allowed to write unless wirelessAPBasicRateChoice is set to fixed(1)