The change to consider mandatory rates for control responses if a
suitable basic rate could not be found broke the tests involving the
wireless/wifi-simple-adhoc-grid example, and the
routing-olsr-regression testsuite.
In these cases it is actually the tests that need updating; in the
wifi-simple-adhoc-grid test and the bug780-test part of the
routing-olsr-regression testsuite, 802.11b rates were being used with
the Wi-Fi PHY standard left at the default of 802.11a. The fix here is
to set the standard to 802.11b in the test.
In the tx-regression-test part of routing-olsr-regression, the problem
was that the reference traces needed to be updated given the control
response rate fix. In this case I have also modified the test to set
the standard to 802.11a for clarity.
This patch attempts to lay some groundwork for enhancements to the Wi-Fi module
by bringing the representation of transmit rates more in line with the
standard.
The key part of the patch is the introduction of a type that corresponds to the
notion of Modulation Class described in IEEE 802.11-2007, Section 9.6.1, Table
9-2.
It also adds coding rate information to the WifiModes and centralises their
construction into a single WifiModeFactory method. The rates are also renamed
with reference to their Modulation Class.
WifiModes no longer have a WifiStandard, but the latter type still exists and is
used to imply the set of WifiModes that a MAC/PHY pair will support.
