macro has to be defined in configuration file.
+CONFIG_MODULE_CALLOUT
+ The 'callout' module is another timer manager that aims to replace the
+ scheduler module. The management of timers can be done either from an
+ asynchronous interruption or from the main program. This module is
+ able to handle priorities between timers and allow to reschedule
+ a timer later if its priority is too low.
+
+
CONFIG_TIME
This module can be used to get a human readable time. It uses the
scheduler module. Its goal is not to be very precise, but just
in wireless sensors.
This modules requires SPI to be activated.
+CONFIG_MODULE_XBEE
+ This modules implements the protocol to use a xbee radio chip.
+ It currently only supports xbee868.
+
+CONFIG_MODULE_XBEE_STATS
+ Enable xbee statistics (takes ~100 bytes per device).
+
+CONFIG_MODULE_XBEE_ATCMD_HELP
+ Embed help strings of AT commands in program memory.
+
CONFIG_MODULE_MENU
The menu module provides some helpers to create a human-machine
interface that uses a tree-organized static menu.