add zeroconf support based on qt4 libraries (#667)

* Removed -HUP so the default -TERM signal is sent instead.
- hyperiond only listens for TERM and INT. HUP is often used to get an exe to reread its config

Changed pgrep to add '-x' so it wont partial match on the exe name.
- I have multiple instances with multiple hyperiond-instance1 names
- this ensures the service script only kills the right process

* reversing errant change to hyperion.systemd.sh

* added bonjour/zeroconf service discovery to the json interface.

When clients are also modified, they can
- find hyperiond on the network much more quickly than ping/portscan;
- find multiple instances running on different ports instead of assuming 19444

* Moved zeroconf calls to hyperiond.cpp

* Added mDNS/zerconf/bonjour registration for proto server

Added config options.
        "jsonServer" :
        {
                "port" : 49444,
//              "mDNSDescr" : "hyperiond jsonServer blah de blah",
                "mDNSService" : "_hyperiond_json._tcp"
        },

* cleaned up a couple of compiler warnings

* moved bitpair_to_byte initialiser to (hopefully) work with older GCC

* compiler warning in udp driver
removed some tabs in ws2812b.cpp

* formatting - spaces to tabs

* moved rpi_281x to tag sk6812-v1.0

* moving to my fork of rpi_281x

* Now uses the led device name and hostname to create the annouce name


Former-commit-id: abfa51bcf359cafa63338181c1b83ecfd231bc87

src/hyperiond/CMakeLists.txt

@@ -35,9 +35,12 @@ if (ENABLE_PROTOBUF)
 	target_link_libraries(hyperiond protoserver)
 endif ()
 
+if (ENABLE_ZEROCONF)
+	target_link_libraries(hyperiond bonjour)
+endif()
+
 install ( TARGETS hyperiond DESTINATION "bin" COMPONENT ambilight )
 install ( DIRECTORY ${CMAKE_SOURCE_DIR}/effects     DESTINATION "share/hyperion/" COMPONENT  ambilight )
 install ( DIRECTORY ${CMAKE_SOURCE_DIR}/bin/service DESTINATION "share/hyperion/" COMPONENT  ambilight )
 install ( DIRECTORY ${CMAKE_SOURCE_DIR}/config      DESTINATION "share/hyperion/" COMPONENT  ambilight )
 
-

src/hyperiond/hyperiond.cpp

@@ -52,6 +52,12 @@
 // Effect engine includes
 #include <effectengine/EffectEngine.h>
 
+#ifdef ENABLE_ZEROCONF
+#include <bonjour/bonjourserviceregister.h>
+#include <bonjour/bonjourrecord.h>
+#include <QHostInfo>
+#endif
+
 // JsonServer includes
 #include <jsonserver/JsonServer.h>
 
@@ -188,6 +194,19 @@ void startNetworkServices(const Json::Value &config, Hyperion &hyperion, JsonSer
 		const Json::Value & jsonServerConfig = config["jsonServer"];
 		jsonServer = new JsonServer(&hyperion, jsonServerConfig["port"].asUInt());
 		std::cout << "INFO: Json server created and started on port " << jsonServer->getPort() << std::endl;
+#ifdef ENABLE_ZEROCONF
+		const Json::Value & deviceConfig = config["device"];
+		const std::string deviceName = deviceConfig.get("name", "").asString();
+
+		const std::string hostname = QHostInfo::localHostName().toStdString();
+		const std::string mDNSDescr = jsonServerConfig.get("mDNSDescr", hostname).asString();
+		const std::string mDNSService = jsonServerConfig.get("mDNSService", "_hyperiond_json._tcp").asString();
+		BonjourServiceRegister *bonjourRegister_json;
+		bonjourRegister_json = new BonjourServiceRegister();
+		bonjourRegister_json->registerService(BonjourRecord((deviceName + " @ " + mDNSDescr).c_str(), mDNSService.c_str(),
+					QString()), jsonServerConfig["port"].asUInt());
+		std::cout << "INFO: Json mDNS responder started" << std::endl;
+#endif
 	}
 
 	// Create Proto server if configuration is present
@@ -196,6 +215,19 @@ void startNetworkServices(const Json::Value &config, Hyperion &hyperion, JsonSer
 		const Json::Value & protoServerConfig = config["protoServer"];
 		protoServer = new ProtoServer(&hyperion, protoServerConfig["port"].asUInt() );
 		std::cout << "INFO: Proto server created and started on port " << protoServer->getPort() << std::endl;
+#ifdef ENABLE_ZEROCONF
+		const Json::Value & deviceConfig = config["device"];
+		const std::string deviceName = deviceConfig.get("name", "").asString();
+
+		const std::string hostname = QHostInfo::localHostName().toStdString();
+		const std::string mDNSDescr = protoServerConfig.get("mDNSDescr", hostname).asString();
+		const std::string mDNSService = protoServerConfig.get("mDNSService", "_hyperiond_proto._tcp").asString();
+		BonjourServiceRegister *bonjourRegister_proto;
+		bonjourRegister_proto = new BonjourServiceRegister();
+		bonjourRegister_proto->registerService(BonjourRecord((deviceName + " @ " + mDNSDescr).c_str(), mDNSService.c_str(),
+					QString()), protoServerConfig["port"].asUInt());
+		std::cout << "INFO: Proto mDNS responder started" << std::endl;
+#endif
 	}
 
 	// Create Boblight server if configuration is present