Added "test app" as a draft zone for... stuff

Added second signature for M2K2 radiosonde

firmware/common/test_packet.cpp

@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 Jared Boone, ShareBrained Technology, Inc.
+ * Copyright (C) 2017 Furrtek
+ *
+ * This file is part of PortaPack.
+ *
+ * This program 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 2, or (at your option)
+ * any later version.
+ *
+ * This program 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 program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "test_packet.hpp"
+#include "string_format.hpp"
+
+namespace testapp {
+
+size_t Packet::length() const {
+	return decoder_.symbols_count();
+}
+
+bool Packet::is_valid() const {
+	return true;
+}
+
+Timestamp Packet::received_at() const {
+	return packet_.timestamp();
+}
+
+FormattedSymbols Packet::symbols_formatted() const {
+	return format_symbols(decoder_);
+}
+
+uint32_t Packet::value() const {
+	return reader_.read(3 * 8, 8);
+}
+
+uint32_t Packet::alt() const {
+	return reader_.read(1 * 8, 12) - 0xC00;
+}
+
+} /* namespace testapp */