diff -r 4d777d6c8024 -r ef8f4023e32e DJMFix.cpp
--- a/DJMFix.cpp	Fri Dec 18 23:58:03 2020 +0100
+++ b/DJMFix.cpp	Sat Dec 19 17:33:16 2020 +0100
@@ -15,7 +15,9 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 #include <iostream>
+#include <iomanip>
 #include <thread>
+#include <atomic>
 #include <chrono>
 #include <stdexcept>
 
@@ -27,8 +29,8 @@
 private:
 	MidiSender* midiSender;
 	std::thread keepAliveThread;
-	bool running = false;
-	bool stopped = false;
+	std::atomic<bool> running{false};
+	std::atomic<bool> stopped{false};
 
 	void run() {
 		while (!stopped) {
@@ -38,6 +40,13 @@
 		}
 	}
 
+	// TODO: remove
+	std::string toString(const MidiMessage& midiMessage) {
+		std::stringstream result;
+		for (uint8_t b : midiMessage) result << std::hex << std::setw(2) << std::setfill('0') << (int) b;
+		return result.str();
+	}
+
 public:
 
 	virtual ~DJMFixImpl() override {
@@ -51,13 +60,22 @@
 	}
 
 	virtual void receive(MidiMessage midiMessage) override {
-		std::cerr << "DJMFixImpl::receive()" << std::endl; // TODO: do not mess STDIO
+		std::cerr << "DJMFixImpl::receive(): size = " << midiMessage.size() << " data = " << toString(midiMessage) << std::endl; // TODO: do not mess STDIO
+
+		if (midiMessage.size() == 54 && midiMessage[9] == 0x13) {
+			std::cerr << "DJMFixImpl::receive(): got message with HashA and SeedE" << std::endl; // TODO: do not mess STDIO
+		}
+
 	}
 
 	void start() override {
 		std::cerr << "DJMFixImpl::start()" << std::endl; // TODO: do not mess STDIO
-		if (midiSender == nullptr) throw std::logic_error("need a midiSender when starting");
-		midiSender->send({0xf0, 0xf7});
+		if (midiSender == nullptr) throw std::logic_error("need a midiSender when starting DJMFix");
+
+		// TODO: methods for parsing and constructing messages from parts (TLV)
+		midiSender->send({0xf0, 0x00, 0x40, 0x05, 0x00, 0x00, 0x00, 0x17, 0x00, 0x50, 0x01, 0xf7});
+		std::this_thread::sleep_for(std::chrono::milliseconds(10));
+		midiSender->send({0xf0, 0x00, 0x40, 0x05, 0x00, 0x00, 0x00, 0x17, 0x00, 0x12, 0x2a, 0x01, 0x0b, 0x50, 0x69, 0x6f, 0x6e, 0x65, 0x65, 0x72, 0x44, 0x4a, 0x02, 0x0b, 0x72, 0x65, 0x6b, 0x6f, 0x72, 0x64, 0x62, 0x6f, 0x78, 0x03, 0x12, 0x02, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x03, 0x04, 0x08, 0x00, 0x00, 0x00, 0x00, 0xf7});
 
 		keepAliveThread = std::thread(&DJMFixImpl::run, this);
 		running = true;