Implement transceiver interface
This change introduces a new block 'TRX Interface', which is aimed
to provide an interface for external applications, such as Osmocom
MS side stack implementation - OsmocomBB. Currently one allows to
exchange raw GSM bursts between GR-GSM and other applications.
Moreover, there is a new 'trx.py' application, which implements a
simple follow graph, where all demodulated bursts are being sent
to external application via UDP link provided by 'TRX Interface'.
OsmoTRX (Osmocom's fork of OpenBTS transceiver) like control
interface is used to initialize, configure, start and stop the
application. Messages on this interface are human readable ASCII
strings, which contain a command and some related parameters.
diff --git a/lib/trx_interface/udp_socket.h b/lib/trx_interface/udp_socket.h
new file mode 100644
index 0000000..2f424c9
--- /dev/null
+++ b/lib/trx_interface/udp_socket.h
@@ -0,0 +1,65 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2013 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio 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.
+ *
+ * GNU Radio 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 GNU Radio; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#ifndef INCLUDED_GRGSM_TRX_UDP_SOCKET_H
+#define INCLUDED_GRGSM_TRX_UDP_SOCKET_H
+
+#include <gnuradio/thread/thread.h>
+
+#include <boost/array.hpp>
+#include <boost/asio.hpp>
+#include <pmt/pmt.h>
+
+namespace gr {
+ namespace grgsm {
+
+ class udp_socket
+ {
+ private:
+ boost::asio::io_service d_io_service;
+ std::vector<char> d_rxbuf;
+ gr::thread::thread d_thread;
+ bool d_started;
+ bool d_finished;
+
+ boost::asio::ip::udp::endpoint d_udp_endpoint_rx;
+ boost::asio::ip::udp::endpoint d_udp_endpoint_tx;
+ boost::shared_ptr<boost::asio::ip::udp::socket> d_udp_socket;
+
+ void handle_udp_read(const boost::system::error_code& error,
+ size_t bytes_transferred);
+ void run_io_service(void);
+
+ public:
+ udp_socket(
+ const std::string &remote_addr,
+ const std::string &src_port,
+ const std::string &dst_port);
+ ~udp_socket();
+
+ void udp_send(uint8_t *data, size_t len);
+ };
+
+ } /* namespace blocks */
+} /* namespace gr */
+
+#endif /* INCLUDED_GRGSM_TRX_UDP_SOCKET_H */