diff --git a/QGCCommon.pri b/QGCCommon.pri
index 39447bb8429e9d6ecede81fd5604b85ee4fe2319..826e4a78f3b328a2fd97e09767ddaa0e9752f7bb 100644
--- a/QGCCommon.pri
+++ b/QGCCommon.pri
@@ -40,6 +40,7 @@ linux {
         DEFINES += QGC_ENABLE_BLUETOOTH
         DEFINES += QGC_GST_TAISYNC_ENABLED
         DEFINES += QGC_GST_MICROHARD_ENABLED 
+        QMAKE_CXXFLAGS += -Wno-address-of-packed-member
         target.path = $$DESTDIR
         equals(ANDROID_TARGET_ARCH, x86)  {
             CONFIG += Androidx86Build
diff --git a/libs/qtandroidserialport/src/qserialport_android.cpp b/libs/qtandroidserialport/src/qserialport_android.cpp
index 32d9110b0e4a0aff4357f18894a624a7d3d62fe3..6d29434306546aef3f8b227fafc90657d74839cf 100644
--- a/libs/qtandroidserialport/src/qserialport_android.cpp
+++ b/libs/qtandroidserialport/src/qserialport_android.cpp
@@ -55,14 +55,13 @@ QT_BEGIN_NAMESPACE
 #define BAD_PORT 0
 
 static const char kJniClassName[] {"org/mavlink/qgroundcontrol/QGCActivity"};
-static const char kJTag[] {"QGC_QSerialPort"};
 
 static void jniDeviceHasDisconnected(JNIEnv *envA, jobject thizA, jint userDataA)
 {
     Q_UNUSED(envA);
     Q_UNUSED(thizA);
     if (userDataA != 0)
-        ((QSerialPortPrivate *)userDataA)->q_ptr->close();
+        (reinterpret_cast<QSerialPortPrivate*>(userDataA))->q_ptr->close();
 }
 
 static void jniDeviceNewData(JNIEnv *envA, jobject thizA, jint userDataA, jbyteArray dataA)
@@ -70,9 +69,9 @@ static void jniDeviceNewData(JNIEnv *envA, jobject thizA, jint userDataA, jbyteA
     Q_UNUSED(thizA);
     if (userDataA != 0)
     {
-        jbyte *bytesL = envA->GetByteArrayElements(dataA, NULL);
+        jbyte *bytesL = envA->GetByteArrayElements(dataA, nullptr);
         jsize lenL = envA->GetArrayLength(dataA);
-        ((QSerialPortPrivate *)userDataA)->newDataArrived((char *)bytesL, lenL);
+        (reinterpret_cast<QSerialPortPrivate*>(userDataA))->newDataArrived(reinterpret_cast<char*>(bytesL), lenL);
         envA->ReleaseByteArrayElements(dataA, bytesL, JNI_ABORT);
     }
 }
@@ -82,12 +81,12 @@ static void jniDeviceException(JNIEnv *envA, jobject thizA, jint userDataA, jstr
     Q_UNUSED(thizA);
     if(userDataA != 0)
     {
-        const char *stringL = envA->GetStringUTFChars(messageA, NULL);
+        const char *stringL = envA->GetStringUTFChars(messageA, nullptr);
         QString strL = QString::fromUtf8(stringL);
         envA->ReleaseStringUTFChars(messageA, stringL);
         if(envA->ExceptionCheck())
             envA->ExceptionClear();
-        ((QSerialPortPrivate *)userDataA)->exceptionArrived(strL);
+        (reinterpret_cast<QSerialPortPrivate*>(userDataA))->exceptionArrived(strL);
     }
 }
 
@@ -95,7 +94,7 @@ static void jniLogDebug(JNIEnv *envA, jobject thizA, jstring messageA)
 {
     Q_UNUSED(thizA);
 
-    const char *stringL = envA->GetStringUTFChars(messageA, NULL);
+    const char *stringL = envA->GetStringUTFChars(messageA, nullptr);
     QString logMessage = QString::fromUtf8(stringL);
     envA->ReleaseStringUTFChars(messageA, stringL);
     if (envA->ExceptionCheck())
@@ -107,7 +106,7 @@ static void jniLogWarning(JNIEnv *envA, jobject thizA, jstring messageA)
 {
     Q_UNUSED(thizA);
 
-    const char *stringL = envA->GetStringUTFChars(messageA, NULL);
+    const char *stringL = envA->GetStringUTFChars(messageA, nullptr);
     QString logMessage = QString::fromUtf8(stringL);
     envA->ReleaseStringUTFChars(messageA, stringL);
     if (envA->ExceptionCheck())
@@ -190,7 +189,7 @@ bool QSerialPortPrivate::open(QIODevice::OpenMode mode)
         "(Landroid/content/Context;Ljava/lang/String;I)I",
         QtAndroid::androidActivity().object(),
         jnameL.object<jstring>(),
-        (jint)this);
+        reinterpret_cast<jint>(this));
     cleanJavaException();
 
     isReadStopped = false;
@@ -395,7 +394,7 @@ void QSerialPortPrivate::startWriting()
 
 bool QSerialPortPrivate::waitForReadyRead(int msecs)
 {
-    int origL = readBuffer.size();
+    int origL = static_cast<int>(readBuffer.size());
 
     if (origL > 0)
         return true;
@@ -528,7 +527,7 @@ void QSerialPortPrivate::newDataArrived(char *bytesA, int lengthA)
 
     // Always buffered, read data from the port into the read buffer
     if (readBufferMaxSize && (bytesToReadL > (readBufferMaxSize - readBuffer.size()))) {
-        bytesToReadL = readBufferMaxSize - readBuffer.size();
+        bytesToReadL = static_cast<int>(readBufferMaxSize - readBuffer.size());
         if (bytesToReadL <= 0) {
             // Buffer is full. User must read data from the buffer
             // before we can read more from the port.
@@ -538,7 +537,7 @@ void QSerialPortPrivate::newDataArrived(char *bytesA, int lengthA)
     }
 
     char *ptr = readBuffer.reserve(bytesToReadL);
-    memcpy(ptr, bytesA, bytesToReadL);
+    memcpy(ptr, bytesA, static_cast<size_t>(bytesToReadL));
 
     emit q->readyRead();
 }
@@ -617,8 +616,8 @@ qint64 QSerialPortPrivate::writeToPort(const char *data, qint64 maxSize)
     }
 
     QAndroidJniEnvironment jniEnv;
-    jbyteArray jarrayL = jniEnv->NewByteArray(maxSize);
-    jniEnv->SetByteArrayRegion(jarrayL, 0, maxSize, (jbyte *)data);
+    jbyteArray jarrayL = jniEnv->NewByteArray(static_cast<jsize>(maxSize));
+    jniEnv->SetByteArrayRegion(jarrayL, 0, static_cast<jsize>(maxSize), (jbyte*)data);
     if (jniEnv->ExceptionCheck())
         jniEnv->ExceptionClear();
     int resultL = QAndroidJniObject::callStaticMethod<jint>(
@@ -640,14 +639,6 @@ qint64 QSerialPortPrivate::writeToPort(const char *data, qint64 maxSize)
     return resultL;
 }
 
-static inline bool evenParity(quint8 c)
-{
-    c ^= c >> 4;        //(c7 ^ c3)(c6 ^ c2)(c5 ^ c1)(c4 ^ c0)
-    c ^= c >> 2;        //[(c7 ^ c3)(c5 ^ c1)][(c6 ^ c2)(c4 ^ c0)]
-    c ^= c >> 1;
-    return c & 1;       //(c7 ^ c3)(c5 ^ c1)(c6 ^ c2)(c4 ^ c0)
-}
-
 typedef QMap<qint32, qint32> BaudRateMap;
 
 // The OS specific defines can be found in termios.h