LOWPAN_NHC_UDP_4BIT_PORT
LOWPAN_NHC_UDP_4BIT_PORT) &&
LOWPAN_NHC_UDP_4BIT_PORT)) {
tmp = ntohs(uh->dest) - LOWPAN_NHC_UDP_4BIT_PORT +
((ntohs(uh->source) - LOWPAN_NHC_UDP_4BIT_PORT) << 4);
uh.source = htons(LOWPAN_NHC_UDP_4BIT_PORT + (val >> 4));
uh.dest = htons(LOWPAN_NHC_UDP_4BIT_PORT + (val & 0x0f));