diff --git a/catlora_sdr/catlora.py b/catlora_sdr/catlora.py
index 516bb78..75cee62 100644
--- a/catlora_sdr/catlora.py
+++ b/catlora_sdr/catlora.py
@@ -13,6 +13,7 @@
 DEFAULT_START_FERQ = 868
 DEFAULT_END_FREQ = 928
 
+
 class SpectrumScan:
     def __init__(self):
         self.catsniffer = Catsniffer()
@@ -25,18 +26,28 @@ def __init__(self):
         self.start_freq = DEFAULT_START_FERQ
         self.end_freq = DEFAULT_END_FREQ
         self.num_ticks = 50
+        self.fig.canvas.mpl_connect("close_event", self.on_close)
 
     def __data_dissector(self, plot_data):
-        raw_data = plot_data[len("@S"):-len("@E")]
+        raw_data = plot_data[len("@S") : -len("@E")]
         freq, data = raw_data.split(";")
         freq = float(freq)
         if freq not in self.frequency_list:
             self.frequency_list.append(freq)
-        
+
         data = list(map(int, data.split(",")[:-1]))
-        index = int(round((freq - self.start_freq) / (self.end_freq - self.start_freq) * (self.num_ticks*12 - 1)))
+        index = int(
+            round(
+                (freq - self.start_freq)
+                / (self.end_freq - self.start_freq)
+                * (self.num_ticks * 12 - 1)
+            )
+        )
         self.data_matrix[:, index] = data
-    
+
+    def on_close(self, event):
+        self.recv_running = False
+
     def stop_task(self):
         self.recv_running = False
 
@@ -58,16 +69,21 @@ def recv_task(self):
                 self.__data_dissector(bytestream)
 
     def create_plot(self):
-        self.ax.set_ylabel('RSSI [dBm]')
-        self.ax.set_xlabel('Frequency (Hz)')
-        self.ax.set_xlim(self.start_freq-5, self.end_freq)
+        self.ax.set_ylabel("RSSI [dBm]")
+        self.ax.set_xlabel("Frequency (Hz)")
+        self.ax.set_xlim(self.start_freq - 5, self.end_freq)
         precise_ticks = np.linspace(self.start_freq, self.end_freq, self.num_ticks)
         self.ax.set_xticks(precise_ticks)
         self.ax.set_xticklabels([f"{tick:.1f}" for tick in precise_ticks], rotation=45)
-        self.ax.set_aspect('auto')
+        self.ax.set_aspect("auto")
         self.fig.suptitle("Catsniffer LoRa Spectral Scan")
         self.fig.canvas.manager.set_window_title("PWNLabs - ElectroniCats")
-        self.im = self.ax.imshow(self.data_matrix, cmap=DEFAULT_COLOR_MAP, aspect='auto', extent=[self.start_freq, self.end_freq, -4*34, DEFAULT_RSSI_OFFSET])
+        self.im = self.ax.imshow(
+            self.data_matrix,
+            cmap=DEFAULT_COLOR_MAP,
+            aspect="auto",
+            extent=[self.start_freq, self.end_freq, -4 * 34, DEFAULT_RSSI_OFFSET],
+        )
         self.fig.colorbar(self.im)
 
     def show_plot(self, i):
@@ -80,10 +96,11 @@ def main(self):
         serial_path = self.catsniffer.find_catsniffer_serial_port()
         print(serial_path)
         self.catsniffer.set_serial_path(serial_path)
+        self.catsniffer.open()
         recv_worker = threading.Thread(target=self.recv_task, daemon=True)
         recv_worker.start()
         self.create_plot()
-        ani = animation.FuncAnimation(self.fig, self.show_plot, interval=100)
+        animation.FuncAnimation(self.fig, self.show_plot, interval=100)
         plt.show()
         while self.recv_running:
             time.sleep(0.1)
@@ -92,6 +109,7 @@ def main(self):
         self.catsniffer.close()
         print("Exited")
 
+
 if __name__ == "__main__":
     sc = SpectrumScan()
     try: