Changed Sonoff 4CH Pro definitions to support built-in interlock mode

code/espurna/config/hardware.h

@@ -454,6 +454,37 @@
     #define BUTTON3_RELAY       3
     #define BUTTON4_RELAY       4
 
+    // Sonoff 4CH Pro uses a secondary STM32 microcontroller to handle
+    // buttons and relays, but it also forwards button presses to the ESP8285.
+    // This allows ESPurna to handle button presses -almost- the same way
+    // as with other devices except:
+    // * Double click seems to break/disable the button on the STM32 side
+    // * With S6 switch to 1 (self-locking and inching modes) everything's OK
+    // * With S6 switch to 0 (interlock mode) if there is a relay ON
+    //    and you click on another relay button, the STM32 sends a "press"
+    //    event for the button of the first relay (to turn it OFF) but it
+    //    does not send a "release" event. It's like it's holding the
+    //    button down since you can see it is still LOW.
+    //    Whatever reason the result is that it may actually perform a
+    //    long click or long-long click.
+    // The configuration below make the button toggle the relay on press events
+    // and disables any possibly harmful combination with S6 set to 0.
+    // If you are sure you will only use S6 to 1 you can comment the
+    // BUTTON1_LNGCLICK and BUTTON1_LNGLNGCLICK options below to recover the
+    // AP mode and factory reset functionalities.
+
+    #define BUTTON1_PRESS       BUTTON_MODE_TOGGLE
+    #define BUTTON1_CLICK       BUTTON_MODE_NONE
+    #define BUTTON1_DBLCLICK    BUTTON_MODE_NONE
+    #define BUTTON1_LNGCLICK    BUTTON_MODE_NONE
+    #define BUTTON1_LNGLNGCLICK BUTTON_MODE_NONE
+    #define BUTTON2_PRESS       BUTTON_MODE_TOGGLE
+    #define BUTTON2_CLICK       BUTTON_MODE_NONE
+    #define BUTTON3_PRESS       BUTTON_MODE_TOGGLE
+    #define BUTTON3_CLICK       BUTTON_MODE_NONE
+    #define BUTTON4_PRESS       BUTTON_MODE_TOGGLE
+    #define BUTTON4_CLICK       BUTTON_MODE_NONE
+
     // Relays
     #define RELAY1_PIN          12
     #define RELAY2_PIN          5