diff --git a/gui/preload-main.js b/gui/preload-main.js
index 8a7f2873..c80a9fba 100644
--- a/gui/preload-main.js
+++ b/gui/preload-main.js
@@ -909,7 +909,15 @@ ipcRenderer.on('action-update-tnc-state', (event, arg) => {
             var toastDATACHANNELreceivedopener = document.getElementById('toastDATACHANNELreceivedopener')
             var toast = bootstrap.Toast.getOrCreateInstance(toastDATACHANNELreceivedopener) // Returns a Bootstrap toast instance
             toast.show()
-        }                       
+        }  
+         // TRANSMISSION STOPPED
+        if (arg.info[i] == "TRANSMISSION;STOPPED"){
+            var toastDATACHANNELreceivedopener = document.getElementById('toastTRANSMISSIONstopped')
+            var toast = bootstrap.Toast.getOrCreateInstance(toastDATACHANNELreceivedopener) // Returns a Bootstrap toast instance
+            toast.show()
+        }         
+               
+                             
          // DATACHANNEL FAILED TOAST
         if (arg.info[i] == "DATACHANNEL;FAILED"){
             var toastDATACHANNELfailed = document.getElementById('toastDATACHANNELfailed')
diff --git a/gui/src/index.html b/gui/src/index.html
index b0498d1d..4072fdbc 100644
--- a/gui/src/index.html
+++ b/gui/src/index.html
@@ -143,6 +143,15 @@
 						<button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast" aria-label="Close"></button>
 					</div>
 				</div>
+			    <!-- STOPPING TRANSMISSION -->
+				<div class="toast align-items-center text-white bg-danger border-0" id="toastTRANSMISSIONstopped" role="alert" aria-live="assertive" aria-atomic="true">
+					<div class="d-flex">
+						<div class="toast-body">Transmission stopped!</div>
+						<button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast" aria-label="Close"></button>
+					</div>
+				</div>
+				
+				
 				<!-- DATACHANNEL RECEIVED OPENER -->
 				<div class="toast align-items-center text-white bg-secondary border-0" id="toastDATACHANNELreceivedopener" role="alert" aria-live="assertive" aria-atomic="true">
 					<div class="d-flex">
diff --git a/tnc/data_handler.py b/tnc/data_handler.py
index efd39b49..be094fc6 100644
--- a/tnc/data_handler.py
+++ b/tnc/data_handler.py
@@ -72,7 +72,9 @@ class DATA():
             if data[0] == 'CQ':
                 # [0] CQ
                 self.transmit_cq()
-                
+            elif data[0] == 'STOP':
+                self.stop_transmission()
+            
             elif data[0] == 'PING':
                 # [0] PING
                 # [1] dxcallsign
@@ -204,6 +206,12 @@ class DATA():
                 structlog.get_logger("structlog").debug("ARQ arq_received_channel_is_open")
                 self.arq_received_channel_is_open(bytes_out[:-2])
 
+    
+            # ARQ STOP TRANSMISSION
+            elif frametype == 227:
+                structlog.get_logger("structlog").debug("ARQ received stop transmis")
+                self.received_stop_transmission(bytes_out[:-2])
+
             # ARQ CONNECT ACK / KEEP ALIVE
             # this is outdated and we may remove it
             elif frametype == 230:
@@ -859,8 +867,31 @@ class DATA():
         static.TNC_STATE = 'IDLE'
     
 
+    def stop_transmission(self):
+        structlog.get_logger("structlog").warning("[TNC] Stopping transmission!")
+        stop_frame      = bytearray(14)
+        stop_frame[:1]  = bytes([227])
+        stop_frame[1:2] = static.DXCALLSIGN_CRC8
+        stop_frame[2:3] = static.MYCALLSIGN_CRC8
 
+        txbuffer = [stop_frame]
+        static.TRANSMITTING = True
+        modem.MODEM_TRANSMIT_QUEUE.put([14,2,250,txbuffer])
+        while static.TRANSMITTING:
+            time.sleep(0.01)
+            
+        static.TNC_STATE = 'IDLE'
+        static.ARQ_STATE = False
+        static.INFO.append("TRANSMISSION;STOPPED")
+        self.arq_cleanup()
 
+    def received_stop_transmission(self):
+        structlog.get_logger("structlog").warning("[TNC] Stopping transmission!")
+        static.TNC_STATE = 'IDLE'
+        static.ARQ_STATE = False
+        static.INFO.append("TRANSMISSION;STOPPED")
+        self.arq_cleanup()
+        
     # ----------- BROADCASTS
     
     def run_beacon(self, interval:int):
diff --git a/tnc/sock.py b/tnc/sock.py
index b0effc2e..601c3e89 100644
--- a/tnc/sock.py
+++ b/tnc/sock.py
@@ -171,6 +171,7 @@ class ThreadedTCPRequestHandler(socketserver.BaseRequestHandler):
                     
                     
                 if received_json["type"] == 'ARQ' and received_json["command"] == "stopTransmission":
+                    data_handler.DATA_QUEUE_TRANSMIT.put(['STOP'])
                     print(" >>> STOPPING TRANSMISSION <<<")
                     structlog.get_logger("structlog").warning("[TNC] Stopping transmission!")
                     static.TNC_STATE = 'IDLE'