<?xml version="1.0"?> <block> <name>Protocol Formatter</name> <key>digital_protocol_formatter_bb</key> <import>from gnuradio import digital</import> <make>digital.protocol_formatter_bb($format, $len_tag_key)</make> <param> <name>Format Obj.</name> <key>format</key> <type>raw</type> </param> <param> <name>Length Tag Name</name> <key>len_tag_key</key> <value>"packet_len"</value> <type>string</type> </param> <sink> <name>in</name> <type>byte</type> </sink> <source> <name>out</name> <type>byte</type> </source> </block>