1011     def _is_mesh_header(self, first_byte):  argument
1012         return ((first_byte >> 6) & 0x03) == 0x02
1014     def _is_first_fragmentation_header(self, first_byte):  argument
1015         return ((first_byte >> 3) & 0x1F) == 0x18
1017     def _is_subsequent_fragmentation_header(self, first_byte):  argument
1018         return ((first_byte >> 3) & 0x1F) == 0x1C
1020     def _is_iphc(self, first_byte):  argument
1021         return ((first_byte >> 5) & 0x07) == 0x03
1116             first_byte = ord(self._peek_n_bytes(data, n=1))
1118             if self._is_mesh_header(first_byte):
1124             elif self._is_first_fragmentation_header(first_byte):
1127             elif self._is_subsequent_fragmentation_header(first_byte):
1130             elif self._is_iphc(first_byte):
1134                 raise RuntimeError("Unsupported header type: 0x{:02x}".format(first_byte))