diff --git a/gr-jay/grc/jay_message_debug.xml b/gr-jay/grc/jay_message_debug.xml
new file mode 100644
index 0000000..b0dbf38
--- /dev/null
+++ b/gr-jay/grc/jay_message_debug.xml
@@ -0,0 +1,21 @@
+
+
+ Message Debug
+ jay_message_debug
+ [jay]
+ import jay
+ jay.message_debug()
+
+
+ control
+ message
+ 1
+
+
+
+ status
+ message
+ 1
+
+
+
diff --git a/gr-jay/include/jay/message_debug.h b/gr-jay/include/jay/message_debug.h
new file mode 100644
index 0000000..1b13a1a
--- /dev/null
+++ b/gr-jay/include/jay/message_debug.h
@@ -0,0 +1,56 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2019 Jay Arrowfield.
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+
+#ifndef INCLUDED_JAY_MESSAGE_DEBUG_H
+#define INCLUDED_JAY_MESSAGE_DEBUG_H
+
+#include
+#include
+
+namespace gr {
+ namespace jay {
+
+ /*!
+ * \brief <+description of block+>
+ * \ingroup jay
+ *
+ */
+ class JAY_API message_debug : virtual public gr::block
+ {
+ public:
+ typedef boost::shared_ptr sptr;
+
+ /*!
+ * \brief Return a shared_ptr to a new instance of jay::message_debug.
+ *
+ * To avoid accidental use of raw pointers, jay::message_debug's
+ * constructor is in a private implementation
+ * class. jay::message_debug::make is the public interface for
+ * creating new instances.
+ */
+ static sptr make();
+ };
+
+ } // namespace jay
+} // namespace gr
+
+#endif /* INCLUDED_JAY_MESSAGE_DEBUG_H */
+
diff --git a/gr-jay/lib/message_debug_impl.cc b/gr-jay/lib/message_debug_impl.cc
new file mode 100644
index 0000000..1f9e7ea
--- /dev/null
+++ b/gr-jay/lib/message_debug_impl.cc
@@ -0,0 +1,86 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2019 Jay Arrowfield.
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include
+#include "message_debug_impl.h"
+
+namespace gr {
+ namespace jay {
+
+ message_debug::sptr
+ message_debug::make()
+ {
+ return gnuradio::get_initial_sptr
+ (new message_debug_impl());
+ }
+
+ /*
+ * The private constructor
+ */
+ message_debug_impl::message_debug_impl()
+ : gr::block("message_debug",
+ gr::io_signature::make(0, 0, sizeof(int)),
+ gr::io_signature::make(0, 0, sizeof(int)))
+ {
+ m_msg_port_in = pmt::mp("control");
+ m_msg_port_out = pmt::mp("status");
+ message_port_register_in(m_msg_port_in);
+ message_port_register_out(m_msg_port_out);
+ set_msg_handler(m_msg_port_in, boost::bind(&message_debug_impl::set_msg, this, _1));
+ }
+
+ /*
+ * Our virtual destructor.
+ */
+ message_debug_impl::~message_debug_impl()
+ {
+ }
+
+ void
+ message_debug_impl::forecast (int noutput_items, gr_vector_int &ninput_items_required)
+ {
+ ninput_items_required[0] = noutput_items;
+ }
+
+ int
+ message_debug_impl::general_work (int noutput_items,
+ gr_vector_int &ninput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items)
+ {
+ const int *in = (const int *) input_items[0];
+ int *out = (int *) output_items[0];
+
+ // Do <+signal processing+>
+ // Tell runtime system how many input items we consumed on
+ // each input stream.
+ consume_each (noutput_items);
+
+ // Tell runtime system how many output items we produced.
+ return noutput_items;
+ }
+
+ } /* namespace jay */
+} /* namespace gr */
+
diff --git a/gr-jay/lib/message_debug_impl.h b/gr-jay/lib/message_debug_impl.h
new file mode 100644
index 0000000..482b089
--- /dev/null
+++ b/gr-jay/lib/message_debug_impl.h
@@ -0,0 +1,65 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2019 Jay Arrowfield.
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_JAY_MESSAGE_DEBUG_IMPL_H
+#define INCLUDED_JAY_MESSAGE_DEBUG_IMPL_H
+
+#include
+
+namespace gr {
+ namespace jay {
+
+ class message_debug_impl : public message_debug
+ {
+ private:
+ // Nothing to declare in this block.
+ pmt::pmt_t m_msg_port_in;
+ pmt::pmt_t m_msg_port_out;
+
+ void set_msg(pmt::pmt_t msg)
+ {
+ if (pmt::is_dict(msg))
+ {
+ fprintf(stderr, "Is dictionary\n!");
+ }
+ else
+ {
+ fprintf(stderr, "Sym: %s\n", pmt::symbol_to_string(msg).c_str());
+ }
+ }
+
+ public:
+ message_debug_impl();
+ ~message_debug_impl();
+
+ // Where all the action really happens
+ void forecast (int noutput_items, gr_vector_int &ninput_items_required);
+
+ int general_work(int noutput_items,
+ gr_vector_int &ninput_items,
+ gr_vector_const_void_star &input_items,
+ gr_vector_void_star &output_items);
+ };
+
+ } // namespace jay
+} // namespace gr
+
+#endif /* INCLUDED_JAY_MESSAGE_DEBUG_IMPL_H */
+