Fix some Wsign-compare warnings

To avoid creating a new warning in DiscoveryManager.cpp, use
static_cast. The IdentityObject takes a CipUint anyway.

On Windows, setsocktopt() with SO_RCVTIMEO takes a uint32_t, but
std::chrono::duration::count() returnes a "signed integer type of at
least 45 bits" [1], so it also produces a warning.

[1]. https://en.cppreference.com/w/cpp/chrono/duration

src/DiscoveryManager.cpp

@@ -48,7 +48,7 @@ namespace eipScanner {
 				CommonPacket commonPacket;
 				commonPacket.expand(std::vector<uint8_t>(data.begin()+EncapsPacket::HEADER_SIZE, data.end()));
 
-				for (int i=0; i < commonPacket.getItems().size(); ++i) {
+				for (size_t i = 0; i < commonPacket.getItems().size(); ++i) {
 					Buffer buffer(commonPacket.getItems()[i].getData());
 					CipUint ignore;
 					sockets::EndPoint socketAddr("", 0);
@@ -65,7 +65,7 @@ namespace eipScanner {
 						   >> revision >> status
 						   >> serialNumber >> productName;
 
-					IdentityObject identityObject(i);
+					IdentityObject identityObject(static_cast<cip::CipUint>(i));
 					identityObject.setVendorId(vendorId);
 					identityObject.setDeviceType(deviceType);
 					identityObject.setProductCode(productCode);

src/cip/EPath.cpp

@@ -132,7 +132,7 @@ namespace cip {
 		_attributeId = 0;
 		_size = 0;
 
-		for (int i = 0; i < data.size() && !buffer.empty(); ++i) {
+		for (size_t i = 0; i < data.size() && !buffer.empty(); ++i) {
 			EPathSegmentTypes segmentType;
 			CipUsint ignore = 0;
 			CipUsint byte;

src/sockets/BaseSocket.cpp

@@ -79,7 +79,7 @@ namespace sockets {
 		_recvTimeout = recvTimeout;
 
 #if defined(_WIN32) || defined(WIN32) || defined(_WIN64)
-                uint32_t ms = recvTimeout.count();
+                auto ms = uint32_t(recvTimeout.count());
                 setsockopt(_sockedFd, SOL_SOCKET, SO_RCVTIMEO, (const char*)&ms, sizeof ms);
 #else
                 timeval tv = makePortableInterval(recvTimeout);

src/vendor/yaskawa/mp3300iec/Yaskawa_EPath.cpp

@@ -102,7 +102,7 @@ namespace cip {
 		_attributeId = 0;
 		_size = 0;
 
-		for (int i = 0; i < data.size() && !buffer.empty(); ++i) {
+		for (size_t i = 0; i < data.size() && !buffer.empty(); ++i) {
 			EPathSegmentTypes segmentType;
 			CipUsint ignore = 0;
 			CipUsint byte;