use hardware mute to manage PTT

client.py

@@ -124,8 +124,10 @@ class ChannelClient:
             use_daemon_default_log=True,
         )
         self.whisplay_interface.board.set_backlight(70)
-        # self.whisplay_interface.board.on_exit_request(self._on_exit_request)
-        # self.whisplay_interface.board.on_focus_revoked(self._on_focus_revoked)
+        if hasattr(self.whisplay_interface.board, "on_exit_request"):
+            self.board.on_exit_request(self._on_exit_request)
+        if hasattr(self.whisplay_interface.board, "on_focus_revoked"):
+            self.board.on_focus_revoked(self._on_focus_revoked)
         self._load_fonts()
         self._setup_whisplay_audio()
 
@@ -274,8 +276,8 @@ class ChannelClient:
         if ch:
             lines.append(ch["hash"][:16] + "..")
         if self._ptt_enabled:
-            lines += ["", "PTT: hold to talk", "Short: always-on"]
-            footer = "Dbl: leave"
+            lines += ["", "PTT: hold to talk", "release to mute"]
+            footer = "Short: always-on | Dbl: leave"
         else:   
             lines += ["", "Always-on (unmuted)"]
             footer = "Short: PTT  Dbl: leave"
@@ -312,7 +314,7 @@ class ChannelClient:
             if self.state == self.STATE_IN_CALL:
                 if self.whisplay_interface.is_pressed and self._ptt_enabled and not self._ptt_active:
                     self._ptt_active = True
-                    self.telephone.unmute_transmit()
+                    self._hw_set_mic_muted(False)
                     if self.whisplay_interface.board:
                         self.whisplay_interface.board.set_rgb(255, 255, 0)
 
@@ -325,12 +327,12 @@ class ChannelClient:
                                 self._show_in_call()
                         else:
                             self._ptt_active = False
-                            self.telephone.mute_transmit()
+                            self._hw_set_mic_muted(True)
                             if self.whisplay_interface.board:
                                 self.whisplay_interface.board.set_rgb(0, 255, 80)
                     elif not self.whisplay_interface.was_long_pressed:
                         self._ptt_enabled = True
-                        self.telephone.mute_transmit()
+                        self._hw_set_mic_muted(True)
                         if self.whisplay_interface.board:
                             self._show_in_call()
 
@@ -460,7 +462,7 @@ class ChannelClient:
             f"{RNS.prettyhexrep(remote_identity.hash)}"
         )
         if self._ptt_enabled:
-            self.telephone.mute_transmit()
+            self._hw_set_mic_muted(True)
         if self.whisplay_interface.board:
             self.whisplay_interface.board.set_rgb(0, 255, 80)
             self._show_in_call()
@@ -481,6 +483,19 @@ class ChannelClient:
                 time.sleep(1)
             self._show_channels()
 
+    def _hw_set_mic_muted(self, muted):
+        if self._wm8960_device is None:
+            return
+        card = self._wm8960_device.split(",")[0].split(":")[-1]
+        state = "off" if muted else "on"
+        try:
+            subprocess.run(
+                ["amixer", "-c", card, "cset", "name='Capture Switch'", state],
+                check=False, capture_output=True, timeout=2,
+            )
+        except Exception:
+            pass
+
     def call_channel(self, index):
         if index < 0 or index >= len(self.channels):
             print("Invalid channel index")