feat(ble): Allow disabling BLE BAS reporting

The battery reporting has been known to cause macOS computers to wakeup repeatedly. In some cases (e.g. display or custom lighting implementation) one might want to collect battery SOC without broadcasting over BLE

app/Kconfig

@@ -314,7 +314,7 @@ config ZMK_BATTERY_REPORTING
     bool "Battery level detection/reporting"
     default n
     select SENSOR
-    select BT_BAS if ZMK_BLE
+    imply BT_BAS if ZMK_BLE
 
 config ZMK_IDLE_TIMEOUT
     int "Milliseconds of inactivity before entering idle state (OLED shutoff, etc)"

app/src/battery.c

@@ -51,7 +51,7 @@ static int zmk_battery_update(const struct device *battery) {
 
     if (last_state_of_charge != state_of_charge.val1) {
         last_state_of_charge = state_of_charge.val1;
-
+#if IS_ENABLED(CONFIG_BT_BAS)
         LOG_DBG("Setting BAS GATT battery level to %d.", last_state_of_charge);
 
         rc = bt_bas_set_battery_level(last_state_of_charge);
@@ -60,7 +60,7 @@ static int zmk_battery_update(const struct device *battery) {
             LOG_WRN("Failed to set BAS GATT battery level (err %d)", rc);
             return rc;
         }
-
+#endif
         rc = ZMK_EVENT_RAISE(new_zmk_battery_state_changed(
             (struct zmk_battery_state_changed){.state_of_charge = last_state_of_charge}));
     }

docs/docs/config/battery.md

@@ -7,6 +7,12 @@ See the [battery level feature page](../features/battery.md) for more details on
 
 See [Configuration Overview](index.md) for instructions on how to change these settings.
 
+:::note
+
+On MacOS the BLE battery reporting packets can cause the computer to wakeup from sleep, the battery service can be disabled indepently of battery monitoring (allowing the battery level to be displayed on a screen or through a custom lighting implementation) by setting `CONFIG_BT_BAS=n`
+
+:::
+
 ### Devicetree
 
 Applies to: [`/chosen` node](https://docs.zephyrproject.org/latest/guides/dts/intro.html#aliases-and-chosen-nodes)