LOWPAN_IPHC_M
iphc1 |= LOWPAN_IPHC_M;
switch (iphc1 & (LOWPAN_IPHC_M | LOWPAN_IPHC_DAC)) {
case LOWPAN_IPHC_M | LOWPAN_IPHC_DAC:
case LOWPAN_IPHC_M: