example:
#include "net/mac/framer-802154.h"
uint16_t panid = 1234;
framer_802154_set_panid(panid);
attention: this only changes the framer panid, you need to change
the radio panid too, e.g. with rf230_set_pan_addr on avr atmega128rfa1
the packetbuf from packet attributes. Two framer modules are included,
one that creates 802.15.4 frame headers, and one that creates a
minimal "nullmac"-style header that only contains the link-local
addresses.