The configuration file consists of optional global parameter settings and
one or more network blocks, e.g. one for each used SSID. The
wpa_supplicant(8) utility will automatically select the best network
based on the order of the network blocks in the configuration file, net-
work security level (WPA/WPA2 is preferred), and signal strength. Com-
ments are indicated with the `#' character; all text to the end of the
line will be ignored.