diff --git a/html/webpage/assets/js/dragdrop.js b/html/webpage/assets/js/dragdrop.js
new file mode 100644
index 0000000..a3082cb
--- /dev/null
+++ b/html/webpage/assets/js/dragdrop.js
@@ -0,0 +1,31 @@
+const dropArea = document.getElementById("drop-area");
+const fileInput = document.getElementById("file-input");
+
+['dragenter', 'dragover', 'dragleave', 'drop'].forEach(eventName => {
+    dropArea.addEventListener(eventName, e => e.preventDefault());
+    dropArea.addEventListener(eventName, e => e.stopPropagation());
+});
+
+['dragenter', 'dragover'].forEach(eventName => {
+    dropArea.addEventListener(eventName, () => dropArea.classList.add('highlight'));
+});
+
+['dragleave', 'drop'].forEach(eventName => {
+    dropArea.addEventListener(eventName, () => dropArea.classList.remove('highlight'));
+});
+
+
+dropArea.addEventListener('click', () => fileInput.click());
+
+dropArea.addEventListener('drop', e => {
+    const files = e.dataTransfer.files;
+    handleFiles(files);
+});
+
+fileInput.addEventListener('change', e => {
+        handleFiles(e.target.files);
+});
+
+function handleFiles(files) {
+    console.log("file dropped");
+}
diff --git a/html/webpage/broadcastzones.html b/html/webpage/broadcastzones.html
index 6a656b2..ef34350 100644
--- a/html/webpage/broadcastzones.html
+++ b/html/webpage/broadcastzones.html
@@ -195,9 +195,9 @@
                                 <table class="table">
                                     <thead>
                                         <tr>
-                                            <th class="col-sm-1">No</th>
-                                            <th class="col-sm-3">Description</th>
-                                            <th class="col">IP Address</th>
+                                            <th class="class05">No</th>
+                                            <th class="class75">Description</th>
+                                            <th class="class20">IP Address</th>
                                         </tr>
                                     </thead>
                                     <tbody id="soundchanneltablebody"></tbody>
@@ -236,11 +236,11 @@
                                 <table class="table">
                                     <thead>
                                         <tr>
-                                            <th class="col-sm-1">No</th>
-                                            <th class="col-sm-2">Description</th>
-                                            <th class="col-sm-2">SoundChannel</th>
-                                            <th class="col-sm-2">ID</th>
-                                            <th class="col">BP</th>
+                                            <th class="class05">No</th>
+                                            <th class="class40">Description</th>
+                                            <th class="class20">SoundChannel</th>
+                                            <th class="class05">ID</th>
+                                            <th class="class30">BP</th>
                                         </tr>
                                     </thead>
                                     <tbody id="broadcastzonetablebody"></tbody>
diff --git a/html/webpage/setting.html b/html/webpage/setting.html
index ae89f21..006b5b5 100644
--- a/html/webpage/setting.html
+++ b/html/webpage/setting.html
@@ -80,6 +80,7 @@
     </div>
     <script src="assets/bootstrap/js/bootstrap.min.js"></script>
     <script src="assets/js/bs-init.js"></script>
+    <script src="assets/js/dragdrop.js"></script>
 </body>
 
 </html>
\ No newline at end of file
diff --git a/src/toa/Vx3K.kt b/src/toa/Vx3K.kt
new file mode 100644
index 0000000..fe713fd
--- /dev/null
+++ b/src/toa/Vx3K.kt
@@ -0,0 +1,266 @@
+package toa
+
+import codes.Somecodes
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.launch
+import org.tinylog.Logger
+import java.net.Inet4Address
+import java.net.InetSocketAddress
+import java.net.Socket
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+import java.util.function.BiConsumer
+
+/**
+ * VX3K Protocol
+ * @param ipaddress IP address of the VX3K device, default to 192.168.14.1
+ * @param port Port number of the VX3K device, from 50050-50053 default to 50053
+ */
+class Vx3K(val ipaddress : String = "192.168.14.1", val port : Int = 50053) {
+    private val remotesocket : InetSocketAddress
+    init{
+        if (port !in 50050..50053){
+            throw IllegalArgumentException("Port number must be between 50050 and 50053")
+        }
+        try{
+            val inet = Inet4Address.getByName(ipaddress)
+            remotesocket = InetSocketAddress(inet, port)
+        } catch (_ : Exception){
+            throw IllegalArgumentException("Invalid IP address: $ipaddress")
+        }
+    }
+
+    /**
+     * Connect to the VX3K device
+     * @param timeout Connection timeout in milliseconds, default to 30000 ms
+     */
+    fun Connect(timeout: Int = 30000){
+        try{
+            val socket = Socket()
+            // read timeout 5 seconds
+            socket.soTimeout = 5000
+            socket.connect(remotesocket, timeout)
+        } catch (e : Exception){
+            Logger.error { "Failed to connect with ${remotesocket.hostName}:${remotesocket.port}, Message: ${e.message}" }
+        }
+    }
+
+    /**
+     * Virtual Contact Input (Commmand 0x1001)
+     * @param ID : Device ID for VX3K, range 0 - 31
+     * @param CIN : Contact Input Number, range 0 - 15 for normal terminal, 16 for emergency contact input1, 17 for emergency contact input2
+     * @param isON : true for ON, false for OFF
+     * @param cb : Callback function with parameters (success: Boolean, message: String)
+     */
+    fun VirtualCIN(ID: Short, CIN: Short, isON: Boolean, cb : BiConsumer<Boolean, String>){
+        val commandID = 0x1001.toShort()
+        if (ID !in 0..31){
+            cb.accept(false, "ID must be between 0 and 31")
+            return
+        }
+        if (CIN !in 0..17){
+            cb.accept(false, "CIN must be between 0 and 17")
+            return
+        }
+        val payload = ByteBuffer.allocate(6).order(ByteOrder.BIG_ENDIAN)
+        payload.putShort(ID)
+        payload.putShort(CIN)
+        payload.putShort(if (isON) 1 else 0)
+        val command = Make_Request_Command(commandID, payload.array())
+        Send_Receive(command,8){
+            success, reply ->
+            if (success){
+                val bb = ByteBuffer.wrap(reply).order(ByteOrder.BIG_ENDIAN)
+                val resp_commandID = bb.short
+                val resp_code = bb.short
+                if (resp_commandID==commandID){
+                    if (resp_code.toInt() == 0){
+                        cb.accept(true, "Virtual CIN command sent successfully to ${remotesocket.hostName}:${remotesocket.port}")
+                    } else {
+                        cb.accept(false, "Virtual CIN command failed with response code $resp_code from ${remotesocket.hostName}:${remotesocket.port}")
+                    }
+                } else {
+                    cb.accept(false, "Invalid response command ID $resp_commandID from ${remotesocket.hostName}:${remotesocket.port}")
+                }
+            } else {
+                cb.accept(false, "Failed to send Virtual CIN command to ${remotesocket.hostName}:${remotesocket.port}")
+            }
+        }
+    }
+
+    /**
+     * Open / Close Audio Input in Broadcast Pattern (Command 0x1003 for old firmware, 0x1101 for new firmware)
+     * @param NewFirmware Set to true if using new firmware version
+     * @param ID Device ID for VX3K, range 0 - 39 for new firmware, 0 - 31 for old firmware
+     * @param Channel Audio Input Channel, range 0 - 3
+     * @param BroadcastZones Vx3K_BroadcastZone object with selected broadcast zones
+     * @param cb Callback function with parameters (success: Boolean, message: String)
+     */
+    fun AudioInput_BroadcastPattern(NewFirmware : Boolean, ID: Short, Channel: Short, BroadcastZones: Vx3K_BroadcastZone, cb: BiConsumer<Boolean, String>){
+        val CommandID = if (NewFirmware) 0x1101.toShort() else 0x1003.toShort()
+        if (NewFirmware){
+            if (ID !in 0..39){
+                cb.accept(false, "ID must be between 0 and 39")
+                return
+            }
+        } else {
+            if (ID !in 0..31){
+                cb.accept(false, "ID must be between 0 and 31")
+                return
+            }
+        }
+        if (Channel !in 0..3){
+            cb.accept(false, "Channel must be between 0 and 3")
+            return
+        }
+
+        val payload = ByteBuffer.allocate(if (NewFirmware) 86 else 70).order(ByteOrder.BIG_ENDIAN)
+        // Audio Input = 1
+        payload.putShort(1)
+        // VX3K ID
+        payload.putShort(ID)
+        // Audio Input Channel
+        payload.putShort(Channel)
+        // Broadcast Pattern Zones
+        payload.put(BroadcastZones.payload)
+        val command = Make_Request_Command(CommandID, payload.array())
+        Send_Receive(command,8){
+            success, reply ->
+            if (success){
+                val bb = ByteBuffer.wrap(reply).order(ByteOrder.BIG_ENDIAN)
+                val resp_commandID = bb.short
+                val resp_code = bb.short
+                if (resp_commandID==CommandID){
+                    if (resp_code.toInt() == 0){
+                        cb.accept(true, "Open Audio Input Broadcast command sent successfully to ${remotesocket.hostName}:${remotesocket.port}")
+                    } else {
+                        cb.accept(false, "Open Audio Input Broadcast command failed with response code $resp_code from ${remotesocket.hostName}:${remotesocket.port}")
+                    }
+                } else {
+                    cb.accept(false, "Invalid response command ID $resp_commandID from ${remotesocket.hostName}:${remotesocket.port}")
+                }
+            } else {
+                cb.accept(false, "Failed to send Open Audio Input Broadcast command to ${remotesocket.hostName}:${remotesocket.port}")
+            }
+        }
+    }
+
+    /**
+     * Open / Close Network Broadcast Pattern (Command 0x1102 for old firmware, 0x1104 for new firmware)
+     * @param NewFirmware Set to true if using new firmware version
+     * @param multicastIP Multicast IP address in string format, from 224.0.0.0 ~ 239.255.255.255, default to 224.0.0.1
+     * @param port UDP Port number, port 5000-5255 is invalid, default to 5300
+     * @param priority Broadcast Priority value, range 1 - 1024, default to 512 (to be checked later)
+     * @param isBGM true for BGM, false for Paging
+     * @param SSRC SSRC value, range 1 - 65535, default to 1 (to be checked later)
+     * @param payloadType RTP Payload Type, range 0 - 127, default to 0 (to be checked later)
+     * @param payloadSize RTP Payload Size, range 0 - 1500, default to 1000 (to be checked later)
+     * @param BroadcastZones Vx3K_BroadcastZone object with selected broadcast zones
+     * @param cb Callback function with parameters (success: Boolean, message: String)
+     */
+    fun Network_BroadcastPattern(NewFirmware: Boolean,multicastIP: String = "224.0.0.1", port: Int = 5300, priority: Int = 512, isBGM: Boolean, SSRC: UShort = 1u, payloadType: Short = 0, payloadSize: Short = 1000, BroadcastZones: Vx3K_BroadcastZone, cb:BiConsumer<Boolean, String>){
+        val CommandID = if (NewFirmware) 0x1104.toShort() else 0x1102.toShort()
+        if (Somecodes.ValidIPV4(multicastIP)){
+            val inet = Inet4Address.getByName(multicastIP)
+            if (inet.isMulticastAddress){
+                if (port in 5256..65535){
+                    if (priority in 1..1024){
+                        if (SSRC in 1u..65535u){
+                            if (payloadType in 0..127){
+                                if (payloadSize in 0..1500){
+                                    val jitterbuffer = 1000 //TODO 32 signed integer, to be checked later
+                                    val payload = ByteBuffer.allocate(if (NewFirmware) 100 else 84)
+                                    payload.put(inet.address)
+                                    payload.putShort(port.toShort())
+                                    payload.putShort(priority.toShort())
+                                    payload.putShort(if (isBGM) 1 else 0)
+                                    payload.putShort(SSRC.toShort())
+                                    payload.putShort(payloadType)
+                                    payload.putShort(payloadSize)
+                                    payload.putInt(jitterbuffer)
+                                    payload.put(BroadcastZones.payload)
+                                    val command = Make_Request_Command(CommandID, payload.array())
+                                    Send_Receive(command,10){
+                                        success, reply ->
+                                        if (success){
+                                            val bb = ByteBuffer.wrap(reply).order(ByteOrder.BIG_ENDIAN)
+                                            val resp_commandID = bb.short
+                                            val resp_code = bb.short
+                                            // buang 2 short
+                                            bb.short
+                                            bb.short
+                                            val sound_source_number = bb.short
+                                            if (resp_commandID==CommandID){
+                                                if (resp_code.toInt() == 0){
+                                                    cb.accept(true, "Open Network Broadcast command sent successfully to ${remotesocket.hostName}:${remotesocket.port}, Sound Source Number: $sound_source_number")
+                                                } else {
+                                                    cb.accept(false, "Open Network Broadcast command failed with response code $resp_code from ${remotesocket.hostName}:${remotesocket.port}")
+                                                }
+                                            } else {
+                                                cb.accept(false, "Invalid response command ID $resp_commandID from ${remotesocket.hostName}:${remotesocket.port}")
+                                            }
+                                        } else {
+                                            cb.accept(false, "Failed to send Open Network Broadcast command to ${remotesocket.hostName}:${remotesocket.port}")
+                                        }
+                                    }
+                                } else cb.accept(false, "Payload Size must be between 0 and 1500")
+                            } else cb.accept(false, "Payload Type must be between 0 and 127")
+                        } else cb.accept(false, "SSRC must be between 1 and 65535")
+                    } else cb.accept(false, "Priority must be between 1 and 1024")
+                } else cb.accept(false, "Port must be greater than 5255 and less than 65536")
+            } else cb.accept(false, "multicastIP must between 224.0.0.0 ~ 239.255.255.255")
+        } else cb.accept(false, "Multicast IP address invalid")
+    }
+
+
+
+    /**
+     * Send command and receive reply from VX3K device
+     * @param command Command byte array to send
+     * @param expectedlength Expected length of the reply byte array
+     * @param cb Callback function with parameters (success: Boolean, reply: ByteArray)
+     */
+    private fun Send_Receive(command: ByteArray, expectedlength: Int,  cb : BiConsumer<Boolean, ByteArray>){
+        CoroutineScope(Dispatchers.IO).launch {
+            try{
+                val tcp = Socket()
+                tcp.soTimeout = 5000
+                tcp.connect(remotesocket, 30000)
+                val outstream = tcp.getOutputStream()
+                val instream = tcp.getInputStream()
+                outstream.write(command)
+                outstream.flush()
+                val reply = ByteArray(expectedlength)
+                instream.read(reply)
+                outstream.close()
+                instream.close()
+                tcp.close()
+                cb.accept(true, reply)
+            } catch (_: Exception){
+                cb.accept(false, ByteArray(0))
+            }
+        }
+    }
+
+    /**
+     * Wrap payload into VX3K Request Command format
+     * @param commandID Command ID
+     * @param Payload Payload data
+     * @return ByteArray of the complete command
+     */
+    private fun Make_Request_Command(commandID: Short, Payload: ByteArray) : ByteArray {
+        val result = ByteBuffer.allocate(8+Payload.size).order(ByteOrder.BIG_ENDIAN)
+        // command ID (2 bytes)
+        result.putShort(commandID)
+        // Response code (2 bytes), set 0 for Request
+        result.putShort(0)
+        // command length = command header (8 bytes) + payload size
+        result.putShort((Payload.size+8).toShort())
+        // flag and reserver = 0 (2 bytes)
+        result.putShort(0)
+        result.put(Payload)
+        // read to byte array
+        return result.array()
+    }
+}
\ No newline at end of file
diff --git a/src/toa/Vx3K_BroadcastZone.kt b/src/toa/Vx3K_BroadcastZone.kt
new file mode 100644
index 0000000..aab2722
--- /dev/null
+++ b/src/toa/Vx3K_BroadcastZone.kt
@@ -0,0 +1,67 @@
+package toa
+
+import kotlin.experimental.and
+import kotlin.experimental.or
+
+/**
+ * VX3K Broadcast Zone Configuration
+ * Old Firmware: Broadcast Zone 1 - 512
+ * New Firmware: Broadcast Zone 1 - 640
+ * @param NewFirmware Set to true if using new firmware version
+ */
+@Suppress("unused")
+class Vx3K_BroadcastZone(val NewFirmware: Boolean = false) {
+    val payload: ByteArray = if (NewFirmware) ByteArray(80) else ByteArray(64)
+
+    /**
+     * Set a zone as active
+     * @param zonenumber Zone number to set (1 to 512 for old firmware, 1 to 640 for new firmware)
+     */
+    fun SetZone(zonenumber: Int){
+        if (zonenumber<1) throw Exception("Minimum zone number is 1")
+        if (NewFirmware){
+            if (zonenumber>640) throw Exception("Maximum zone number is 640 for new firmware")
+        } else {
+            if (zonenumber>512) throw Exception("Maximum zone number is 512 for old firmware")
+        }
+
+        val byteIndex = (zonenumber - 1) / 8
+        val bitIndex = (zonenumber - 1) % 8
+        payload[byteIndex] = payload[byteIndex] or (1 shl bitIndex).toByte()
+    }
+
+    /**
+     * Clear a zone (set as inactive)
+     * @param zonenumber Zone number to clear (1 to 512 for old firmware, 1 to 640 for new firmware)
+     */
+    fun ClearZone(zonenumber: Int){
+        if (zonenumber<1) throw Exception("Minimum zone number is 1")
+        if (NewFirmware){
+            if (zonenumber>640) throw Exception("Maximum zone number is 640 for new firmware")
+        } else {
+            if (zonenumber>512) throw Exception("Maximum zone number is 512 for old firmware")
+        }
+
+        val byteIndex = (zonenumber - 1) / 8
+        val bitIndex = (zonenumber - 1) % 8
+        payload[byteIndex] = payload[byteIndex] and ((1 shl bitIndex).inv().toByte())
+    }
+
+    /**
+     * Set all zones as active
+     */
+    fun SetAllZones(){
+        for (i in payload.indices){
+            payload[i] = 0xFF.toByte()
+        }
+    }
+
+    /**
+     * Clear all zones (set all as inactive)
+     */
+    fun ClearAllZones(){
+        for (i in payload.indices){
+            payload[i] = 0
+        }
+    }
+}
\ No newline at end of file