Merge c0a3d490b0 into 7be955ff72

app/CMakeLists.txt

@@ -89,6 +89,7 @@ target_sources_ifdef(CONFIG_ZMK_BATTERY_REPORTING app PRIVATE src/battery.c)
 target_sources_ifdef(CONFIG_ZMK_HID_INDICATORS app PRIVATE src/events/hid_indicators_changed.c)
 
 target_sources_ifdef(CONFIG_ZMK_SPLIT app PRIVATE src/events/split_peripheral_status_changed.c)
+target_sources_ifdef(CONFIG_ZMK_SPLIT app PRIVATE src/events/split_data_xfer_event.c)
 add_subdirectory(src/split)
 
 target_sources_ifdef(CONFIG_USB_DEVICE_STACK app PRIVATE src/usb.c)

app/include/zmk/events/split_data_xfer_event.h

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2023 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+#include <zephyr/kernel.h>
+#include <zmk/event_manager.h>
+#include <zmk/split/bluetooth/service.h>
+
+struct zmk_split_data_xfer_event {
+    struct zmk_split_data_xfer_data data_xfer;
+};
+
+ZMK_EVENT_DECLARE(zmk_split_data_xfer_event);

app/include/zmk/split/bluetooth/central.h

@@ -3,22 +3,14 @@
 
 #include <zephyr/bluetooth/addr.h>
 #include <zmk/behavior.h>
-
+#include <zmk/split/bluetooth/service.h>
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
-#include <zmk/hid_indicators_types.h>
-#endif // IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
 
 int zmk_split_bt_invoke_behavior(uint8_t source, struct zmk_behavior_binding *binding,
                                  struct zmk_behavior_binding_event event, bool state);
 
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
-
-int zmk_split_bt_update_hid_indicator(zmk_hid_indicators_t indicators);
-
-#endif // IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
-
 #if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING)
 
 int zmk_split_get_peripheral_battery_level(uint8_t source, uint8_t *level);
 
 #endif // IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING)
+int zmk_split_central_send_data(enum data_tag, uint8_t data_size, uint8_t *data);

app/include/zmk/split/bluetooth/service.h

@@ -10,6 +10,20 @@
 #include <zmk/sensors.h>
 
 #define ZMK_SPLIT_RUN_BEHAVIOR_DEV_LEN 9
+#define ZMK_SPLIT_DATA_XFER_MAX_LEN 16
+
+enum data_tag {
+    // RGB state
+    DATA_TAG_RGB_STATE,
+    // Backlight state
+    DATA_TAG_BACKLIGHT_STATE,
+    // HID indicators state
+    DATA_TAG_HID_INDICATORS_STATE,
+    // Keymap state
+    DATA_TAG_KEYMAP_STATE,
+    // Start of custom tags
+    DATA_TAG_CUSTOM_START,
+};
 
 struct sensor_event {
     uint8_t sensor_index;
@@ -30,6 +44,12 @@ struct zmk_split_run_behavior_payload {
     char behavior_dev[ZMK_SPLIT_RUN_BEHAVIOR_DEV_LEN];
 } __packed;
 
+struct zmk_split_data_xfer_data {
+    enum data_tag data_tag;
+    uint8_t data_size;
+    uint8_t data[ZMK_SPLIT_DATA_XFER_MAX_LEN];
+} __packed;
+
 int zmk_split_bt_position_pressed(uint8_t position);
 int zmk_split_bt_position_released(uint8_t position);
 int zmk_split_bt_sensor_triggered(uint8_t sensor_index,

app/include/zmk/split/bluetooth/uuid.h

@@ -17,4 +17,4 @@
 #define ZMK_SPLIT_BT_CHAR_POSITION_STATE_UUID ZMK_BT_SPLIT_UUID(0x00000001)
 #define ZMK_SPLIT_BT_CHAR_RUN_BEHAVIOR_UUID ZMK_BT_SPLIT_UUID(0x00000002)
 #define ZMK_SPLIT_BT_CHAR_SENSOR_STATE_UUID ZMK_BT_SPLIT_UUID(0x00000003)
-#define ZMK_SPLIT_BT_UPDATE_HID_INDICATORS_UUID ZMK_BT_SPLIT_UUID(0x00000004)
+#define ZMK_SPLIT_BT_CHAR_DATA_XFER_UUID ZMK_BT_SPLIT_UUID(0x00000004)

app/src/backlight.c

@@ -16,9 +16,19 @@
 #include <zmk/activity.h>
 #include <zmk/backlight.h>
 #include <zmk/usb.h>
+#include <zmk/ble.h>
 #include <zmk/event_manager.h>
 #include <zmk/events/activity_state_changed.h>
 #include <zmk/events/usb_conn_state_changed.h>
+#include <zmk/events/split_peripheral_status_changed.h>
+#include <zmk/workqueue.h>
+
+// Pull data sending framework if central, data receiving eventt if peripheral(s)
+#if ZMK_BLE_IS_CENTRAL
+#include <zmk/split/bluetooth/central.h>
+#elif IS_ENABLED(CONFIG_ZMK_SPLIT)
+#include <zmk/events/split_data_xfer_event.h>
+#endif
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
@@ -42,7 +52,25 @@ struct backlight_state {
 static struct backlight_state state = {.brightness = CONFIG_ZMK_BACKLIGHT_BRT_START,
                                        .on = IS_ENABLED(CONFIG_ZMK_BACKLIGHT_ON_START)};
 
+#if ZMK_BLE_IS_CENTRAL
+
+static void zmk_backlight_send_state(struct k_work *work) {
+    LOG_HEXDUMP_DBG(&state, sizeof(struct backlight_state), "backlight state");
+    int err = zmk_split_central_send_data(DATA_TAG_BACKLIGHT_STATE, sizeof(struct backlight_state),
+                                          (uint8_t *)&state);
+    if (err) {
+        LOG_ERR("send failed (err %d)", err);
+    }
+}
+
+K_WORK_DEFINE(backlight_send_state_work, zmk_backlight_send_state);
+
+#endif
+
 static int zmk_backlight_update(void) {
+#if ZMK_BLE_IS_CENTRAL
+    k_work_submit_to_queue(zmk_workqueue_lowprio_work_q(), &backlight_send_state_work);
+#endif
     uint8_t brt = zmk_backlight_get_brt();
     LOG_DBG("Update backlight brightness: %d%%", brt);
 
@@ -157,7 +185,10 @@ static int backlight_auto_state(bool *prev_state, bool new_state) {
     *prev_state = !new_state;
     return zmk_backlight_update();
 }
+#endif
 
+#if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_IDLE) ||                                              \
+    IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB) || ZMK_BLE_IS_CENTRAL
 static int backlight_event_listener(const zmk_event_t *eh) {
 
 #if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_IDLE)
@@ -174,12 +205,19 @@ static int backlight_event_listener(const zmk_event_t *eh) {
     }
 #endif
 
+#if ZMK_BLE_IS_CENTRAL
+    if (as_zmk_split_peripheral_status_changed(eh)) {
+        // TODO: Have this only update when connected
+        k_work_submit_to_queue(zmk_workqueue_lowprio_work_q(), &backlight_send_state_work);
+    }
+#endif
+
     return -ENOTSUP;
 }
 
 ZMK_LISTENER(backlight, backlight_event_listener);
 #endif // IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_IDLE) ||
-       // IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB)
+       // IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_USB) || ZMK_BLE_IS_CENTRAL
 
 #if IS_ENABLED(CONFIG_ZMK_BACKLIGHT_AUTO_OFF_IDLE)
 ZMK_SUBSCRIPTION(backlight, zmk_activity_state_changed);
@@ -189,4 +227,27 @@ ZMK_SUBSCRIPTION(backlight, zmk_activity_state_changed);
 ZMK_SUBSCRIPTION(backlight, zmk_usb_conn_state_changed);
 #endif
 
+#if ZMK_BLE_IS_CENTRAL
+ZMK_SUBSCRIPTION(backlight, zmk_split_peripheral_status_changed);
+#endif
+
+#if IS_ENABLED(CONFIG_ZMK_SPLIT) && !IS_ENABLED(CONFIG_ZMK_SPLIT_ROLE_CENTRAL)
+
+static int backlight_data_event_listener(const zmk_event_t *eh) {
+    const struct zmk_split_data_xfer_event *ev = as_zmk_split_data_xfer_event(eh);
+    if (ev->data_xfer.data_tag == DATA_TAG_BACKLIGHT_STATE) {
+        LOG_DBG("Backlight Data received of size: %d", ev->data_xfer.data_size);
+        LOG_HEXDUMP_DBG(ev->data_xfer.data, sizeof(struct zmk_split_data_xfer_event),
+                        "received event:");
+        memcpy(&state, ev->data_xfer.data, sizeof(struct backlight_state));
+        LOG_HEXDUMP_DBG(&state, sizeof(struct backlight_state), "backlight state");
+        zmk_backlight_update_and_save();
+    }
+    return 0;
+}
+
+ZMK_LISTENER(backlight_data, backlight_data_event_listener);
+ZMK_SUBSCRIPTION(backlight_data, zmk_split_data_xfer_event);
+#endif
+
 SYS_INIT(zmk_backlight_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);

app/src/behaviors/behavior_backlight.c

@@ -88,7 +88,7 @@ static const struct behavior_driver_api behavior_backlight_driver_api = {
         on_keymap_binding_convert_central_state_dependent_params,
     .binding_pressed = on_keymap_binding_pressed,
     .binding_released = on_keymap_binding_released,
-    .locality = BEHAVIOR_LOCALITY_GLOBAL,
+    .locality = BEHAVIOR_LOCALITY_CENTRAL,
 };
 
 BEHAVIOR_DT_INST_DEFINE(0, behavior_backlight_init, NULL, NULL, NULL, POST_KERNEL,

app/src/behaviors/behavior_rgb_underglow.c

@@ -146,7 +146,7 @@ static const struct behavior_driver_api behavior_rgb_underglow_driver_api = {
         on_keymap_binding_convert_central_state_dependent_params,
     .binding_pressed = on_keymap_binding_pressed,
     .binding_released = on_keymap_binding_released,
-    .locality = BEHAVIOR_LOCALITY_GLOBAL,
+    .locality = BEHAVIOR_LOCALITY_CENTRAL,
 };
 
 BEHAVIOR_DT_INST_DEFINE(0, behavior_rgb_underglow_init, NULL, NULL, NULL, POST_KERNEL,

app/src/events/split_data_xfer_event.c

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2023 The ZMK Contributors
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <zephyr/kernel.h>
+#include <zmk/events/split_data_xfer_event.h>
+
+ZMK_EVENT_IMPL(zmk_split_data_xfer_event);

app/src/hid_indicators.c

@@ -13,6 +13,8 @@
 #include <zmk/events/hid_indicators_changed.h>
 #include <zmk/events/endpoint_changed.h>
 #include <zmk/split/bluetooth/central.h>
+#include <zmk/events/split_peripheral_status_changed.h>
+#include <zmk/workqueue.h>
 
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
@@ -27,14 +29,23 @@ zmk_hid_indicators_t zmk_hid_indicators_get_profile(struct zmk_endpoint_instance
     return hid_indicators[profile];
 }
 
+static void zmk_hid_indicators_send_state(struct k_work *work) {
+    zmk_hid_indicators_t indicators = zmk_hid_indicators_get_current_profile();
+    int err = zmk_split_central_send_data(DATA_TAG_HID_INDICATORS_STATE,
+                                          sizeof(zmk_hid_indicators_t), (uint8_t *)&indicators);
+    if (err) {
+        LOG_ERR("HID indicators send failed (err %d)", err);
+    }
+}
+
+K_WORK_DEFINE(hid_indicators_send_state_work, zmk_hid_indicators_send_state);
+
 static void raise_led_changed_event(struct k_work *_work) {
     const zmk_hid_indicators_t indicators = zmk_hid_indicators_get_current_profile();
 
     raise_zmk_hid_indicators_changed((struct zmk_hid_indicators_changed){.indicators = indicators});
 
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS) && IS_ENABLED(CONFIG_ZMK_SPLIT_BLE)
+    k_work_submit_to_queue(zmk_workqueue_lowprio_work_q(), &hid_indicators_send_state_work);
-    zmk_split_bt_update_hid_indicator(indicators);
-#endif
 }
 
 static K_WORK_DEFINE(led_changed_work, raise_led_changed_event);
@@ -60,9 +71,14 @@ void zmk_hid_indicators_process_report(struct zmk_hid_led_report_body *report,
 }
 
 static int profile_listener(const zmk_event_t *eh) {
+    if (as_zmk_endpoint_changed(eh)) {
         raise_led_changed_event(NULL);
+    } else if (as_zmk_split_peripheral_status_changed(eh)) {
+        k_work_submit_to_queue(zmk_workqueue_lowprio_work_q(), &hid_indicators_send_state_work);
+    }
     return 0;
 }
 
 static ZMK_LISTENER(profile_listener, profile_listener);
 static ZMK_SUBSCRIPTION(profile_listener, zmk_endpoint_changed);
+static ZMK_SUBSCRIPTION(profile_listener, zmk_split_peripheral_status_changed);

app/src/keymap.c

@@ -97,10 +97,14 @@ static inline int set_layer_state(uint8_t layer, bool state) {
     // Don't send state changes unless there was an actual change
     if (old_state != _zmk_keymap_layer_state) {
         LOG_DBG("layer_changed: layer %d state %d", layer, state);
-        ret = raise_layer_state_changed(layer, state);
+        raise_layer_state_changed(layer, state);
-        if (ret < 0) {
+#if ZMK_BLE_IS_CENTRAL
-            LOG_WRN("Failed to raise layer state changed (%d)", ret);
+        int err = zmk_split_central_send_data(DATA_TAG_KEYMAP_STATE, sizeof(uint32_t),
+                                              (uint8_t *)&_zmk_keymap_layer_state);
+        if (err) {
+            LOG_ERR("Keymap send failed (err %d)", err);
         }
+#endif
     }
 
     return ret;

app/src/rgb_underglow.c

@@ -21,11 +21,20 @@
 
 #include <zmk/activity.h>
 #include <zmk/usb.h>
+#include <zmk/ble.h>
 #include <zmk/event_manager.h>
 #include <zmk/events/activity_state_changed.h>
 #include <zmk/events/usb_conn_state_changed.h>
+#include <zmk/events/split_peripheral_status_changed.h>
 #include <zmk/workqueue.h>
 
+// Pull data sending framework if central, data receiving event if peripheral(s)
+#if ZMK_BLE_IS_CENTRAL
+#include <zmk/split/bluetooth/central.h>
+#elif IS_ENABLED(CONFIG_ZMK_SPLIT)
+#include <zmk/events/split_data_xfer_event.h>
+#endif
+
 LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
 #if !DT_HAS_CHOSEN(zmk_underglow)
@@ -130,6 +139,21 @@ static struct led_rgb hsb_to_rgb(struct zmk_led_hsb hsb) {
     return rgb;
 }
 
+#if ZMK_BLE_IS_CENTRAL
+
+static void zmk_rgb_send_state(struct k_work *work) {
+    LOG_HEXDUMP_DBG(&state, sizeof(struct rgb_underglow_state), "RGB state");
+    int err = zmk_split_central_send_data(DATA_TAG_RGB_STATE, sizeof(struct rgb_underglow_state),
+                                          (uint8_t *)&state);
+    if (err) {
+        LOG_ERR("send failed (err %d)", err);
+    }
+}
+
+K_WORK_DEFINE(rgb_send_state_work, zmk_rgb_send_state);
+
+#endif
+
 static void zmk_rgb_underglow_effect_solid(void) {
     for (int i = 0; i < STRIP_NUM_PIXELS; i++) {
         pixels[i] = hsb_to_rgb(hsb_scale_min_max(state.color));
@@ -191,6 +215,14 @@ static void zmk_rgb_underglow_tick(struct k_work *work) {
         break;
     }
 
+#if ZMK_BLE_IS_CENTRAL
+    // Every time the counter rolls to 1 synchronise the animations (If it was 0 then it constantly
+    // syncs when effect is a solid color)
+    if (state.animation_step == 1) {
+        k_work_submit_to_queue(zmk_workqueue_lowprio_work_q(), &rgb_send_state_work);
+    }
+#endif
+
     int err = led_strip_update_rgb(led_strip, pixels, STRIP_NUM_PIXELS);
     if (err < 0) {
         LOG_ERR("Failed to update the RGB strip (%d)", err);
@@ -278,7 +310,9 @@ static int zmk_rgb_underglow_init(void) {
 #if IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_AUTO_OFF_USB)
     state.on = zmk_usb_is_powered();
 #endif
-
+#if ZMK_BLE_IS_CENTRAL
+    k_work_submit_to_queue(zmk_workqueue_lowprio_work_q(), &rgb_send_state_work);
+#endif
     if (state.on) {
         k_timer_start(&underglow_tick, K_NO_WAIT, K_MSEC(50));
     }
@@ -287,6 +321,10 @@ static int zmk_rgb_underglow_init(void) {
 }
 
 int zmk_rgb_underglow_save_state(void) {
+    // Send new state to peripheral when anything changes
+#if ZMK_BLE_IS_CENTRAL
+    k_work_submit_to_queue(zmk_workqueue_lowprio_work_q(), &rgb_send_state_work);
+#endif
 #if IS_ENABLED(CONFIG_SETTINGS)
     int ret = k_work_reschedule(&underglow_save_work, K_MSEC(CONFIG_ZMK_SETTINGS_SAVE_DEBOUNCE));
     return MIN(ret, 0);
@@ -319,7 +357,6 @@ int zmk_rgb_underglow_on(void) {
     state.on = true;
     state.animation_step = 0;
     k_timer_start(&underglow_tick, K_NO_WAIT, K_MSEC(50));
-
     return zmk_rgb_underglow_save_state();
 }
 
@@ -496,8 +533,12 @@ static int rgb_underglow_auto_state(bool target_wake_state) {
         return zmk_rgb_underglow_off();
     }
 }
+#endif
 
-static int rgb_underglow_event_listener(const zmk_event_t *eh) {
+#if IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_AUTO_OFF_IDLE) ||                                          \
+    IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_AUTO_OFF_USB) || ZMK_BLE_IS_CENTRAL
+
+static int rgb_underglow_activity_event_listener(const zmk_event_t *eh) {
 
 #if IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_AUTO_OFF_IDLE)
     if (as_zmk_activity_state_changed(eh)) {
@@ -511,19 +552,57 @@ static int rgb_underglow_event_listener(const zmk_event_t *eh) {
     }
 #endif
 
+#if ZMK_BLE_IS_CENTRAL
+    if (as_zmk_split_peripheral_status_changed(eh)) {
+        // TODO: Have this only update when connected
+        k_work_submit_to_queue(zmk_workqueue_lowprio_work_q(), &rgb_send_state_work);
+    }
+#endif
+
     return -ENOTSUP;
 }
 
-ZMK_LISTENER(rgb_underglow, rgb_underglow_event_listener);
+ZMK_LISTENER(rgb_underglow_activity, rgb_underglow_activity_event_listener);
 #endif // IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_AUTO_OFF_IDLE) ||
-       // IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_AUTO_OFF_USB)
+       // IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_AUTO_OFF_USB) || ZMK_BLE_IS_CENTRAL
 
 #if IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_AUTO_OFF_IDLE)
-ZMK_SUBSCRIPTION(rgb_underglow, zmk_activity_state_changed);
+ZMK_SUBSCRIPTION(rgb_underglow_activity, zmk_activity_state_changed);
 #endif
 
 #if IS_ENABLED(CONFIG_ZMK_RGB_UNDERGLOW_AUTO_OFF_USB)
-ZMK_SUBSCRIPTION(rgb_underglow, zmk_usb_conn_state_changed);
+ZMK_SUBSCRIPTION(rgb_underglow_activity, zmk_usb_conn_state_changed);
+#endif
+
+#if ZMK_BLE_IS_CENTRAL
+ZMK_SUBSCRIPTION(rgb_underglow_activity, zmk_split_peripheral_status_changed);
+#endif
+
+#if IS_ENABLED(CONFIG_ZMK_SPLIT) && !IS_ENABLED(CONFIG_ZMK_SPLIT_ROLE_CENTRAL)
+
+static int rgb_underglow_data_event_listener(const zmk_event_t *eh) {
+    const struct zmk_split_data_xfer_event *ev = as_zmk_split_data_xfer_event(eh);
+    if (ev->data_xfer.data_tag == DATA_TAG_RGB_STATE) {
+        LOG_DBG("RGB Data received of size: %d", ev->data_xfer.data_size);
+        // Should the RGB timer be stopped and started during this operation to keep state safe?
+        LOG_HEXDUMP_DBG(ev->data_xfer.data, sizeof(struct zmk_split_data_xfer_event),
+                        "received event:");
+        static bool prev_state = false;
+        memcpy(&state, ev->data_xfer.data, sizeof(struct rgb_underglow_state));
+        LOG_HEXDUMP_DBG(&state, sizeof(struct rgb_underglow_state), "RGB state");
+        LOG_DBG("new on_state %d", state.on);
+        if (prev_state && !state.on) {
+            zmk_rgb_underglow_off();
+        } else if (!prev_state && state.on) {
+            zmk_rgb_underglow_on();
+        }
+        prev_state = state.on;
+    }
+    return 0;
+}
+
+ZMK_LISTENER(rgb_underglow_data, rgb_underglow_data_event_listener);
+ZMK_SUBSCRIPTION(rgb_underglow_data, zmk_split_data_xfer_event);
 #endif
 
 SYS_INIT(zmk_rgb_underglow_init, APPLICATION, CONFIG_APPLICATION_INIT_PRIORITY);

app/src/split/bluetooth/Kconfig

@@ -58,6 +58,14 @@ config ZMK_SPLIT_BLE_CENTRAL_SPLIT_RUN_QUEUE_SIZE
     int "Max number of behavior run events to queue to send to the peripheral(s)"
     default 5
 
+config ZMK_SPLIT_BLE_CENTRAL_DATA_XFER_STACK_SIZE
+    int "BLE split central to peripheral thread stack size"
+    default 512
+
+config ZMK_SPLIT_BLE_CENTRAL_DATA_XFER_QUEUE_SIZE
+    int "Max number of data transfer requests to queue to send to the peripheral(s)"
+    default 5
+
 config ZMK_SPLIT_BLE_PREF_INT
     int "Connection interval to use for split central/peripheral connection"
     default 6

app/src/split/bluetooth/central.c

@@ -28,7 +28,7 @@ LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 #include <zmk/events/position_state_changed.h>
 #include <zmk/events/sensor_event.h>
 #include <zmk/events/battery_state_changed.h>
-#include <zmk/hid_indicators_types.h>
+#include <zmk/events/split_peripheral_status_changed.h>
 
 static int start_scanning(void);
 
@@ -52,9 +52,7 @@ struct peripheral_slot {
     struct bt_gatt_subscribe_params batt_lvl_subscribe_params;
     struct bt_gatt_read_params batt_lvl_read_params;
 #endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING) */
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
+    uint16_t data_xfer_handle;
-    uint16_t update_hid_indicators;
-#endif // IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
     uint8_t position_state[POSITION_STATE_DATA_LEN];
     uint8_t changed_positions[POSITION_STATE_DATA_LEN];
 };
@@ -140,9 +138,7 @@ int release_peripheral_slot(int index) {
     // Clean up previously discovered handles;
     slot->subscribe_params.value_handle = 0;
     slot->run_behavior_handle = 0;
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
+    slot->data_xfer_handle = 0;
-    slot->update_hid_indicators = 0;
-#endif // IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
 
     return 0;
 }
@@ -441,12 +437,29 @@ static uint8_t split_central_chrc_discovery_func(struct bt_conn *conn,
         slot->discover_params.uuid = NULL;
         slot->discover_params.start_handle = attr->handle + 2;
         slot->run_behavior_handle = bt_gatt_attr_value_handle(attr);
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
+
+#if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING)
     } else if (!bt_uuid_cmp(((struct bt_gatt_chrc *)attr->user_data)->uuid,
-                            BT_UUID_DECLARE_128(ZMK_SPLIT_BT_UPDATE_HID_INDICATORS_UUID))) {
+                            BT_UUID_BAS_BATTERY_LEVEL)) {
-        LOG_DBG("Found update HID indicators handle");
+        LOG_DBG("Found battery level characteristics");
-        slot->update_hid_indicators = bt_gatt_attr_value_handle(attr);
+        slot->batt_lvl_subscribe_params.disc_params = &slot->sub_discover_params;
-#endif // IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
+        slot->batt_lvl_subscribe_params.end_handle = slot->discover_params.end_handle;
+        slot->batt_lvl_subscribe_params.value_handle = bt_gatt_attr_value_handle(attr);
+        slot->batt_lvl_subscribe_params.notify = split_central_battery_level_notify_func;
+        slot->batt_lvl_subscribe_params.value = BT_GATT_CCC_NOTIFY;
+        split_central_subscribe(conn, &slot->batt_lvl_subscribe_params);
+
+        slot->batt_lvl_read_params.func = split_central_battery_level_read_func;
+        slot->batt_lvl_read_params.handle_count = 1;
+        slot->batt_lvl_read_params.single.handle = bt_gatt_attr_value_handle(attr);
+        slot->batt_lvl_read_params.single.offset = 0;
+        bt_gatt_read(conn, &slot->batt_lvl_read_params);
+#endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING) */
+    } else if (bt_uuid_cmp(chrc_uuid, BT_UUID_DECLARE_128(ZMK_SPLIT_BT_CHAR_DATA_XFER_UUID)) == 0) {
+        LOG_DBG("Found data transfer handle");
+        slot->discover_params.uuid = NULL;
+        slot->discover_params.start_handle = attr->handle + 2;
+        slot->data_xfer_handle = bt_gatt_attr_value_handle(attr);
 #if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING)
     } else if (!bt_uuid_cmp(((struct bt_gatt_chrc *)attr->user_data)->uuid,
                             BT_UUID_BAS_BATTERY_LEVEL)) {
@@ -466,15 +479,12 @@ static uint8_t split_central_chrc_discovery_func(struct bt_conn *conn,
 #endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING) */
     }
 
-    bool subscribed = slot->run_behavior_handle && slot->subscribe_params.value_handle;
+    bool subscribed =
-
+        slot->run_behavior_handle && slot->data_xfer_handle && slot->subscribe_params.value_handle;
 #if ZMK_KEYMAP_HAS_SENSORS
     subscribed = subscribed && slot->sensor_subscribe_params.value_handle;
 #endif /* ZMK_KEYMAP_HAS_SENSORS */
 
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
-    subscribed = subscribed && slot->update_hid_indicators;
-#endif // IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
 #if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING)
     subscribed = subscribed && slot->batt_lvl_subscribe_params.value_handle;
 #endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING) */
@@ -712,6 +722,8 @@ static void split_central_connected(struct bt_conn *conn, uint8_t conn_err) {
 
     confirm_peripheral_slot_conn(conn);
     split_central_process_connection(conn);
+    raise_zmk_split_peripheral_status_changed(
+        (struct zmk_split_peripheral_status_changed){.connected = true});
 }
 
 static void split_central_disconnected(struct bt_conn *conn, uint8_t reason) {
@@ -728,6 +740,8 @@ static void split_central_disconnected(struct bt_conn *conn, uint8_t reason) {
     k_msgq_put(&peripheral_batt_lvl_msgq, &ev, K_NO_WAIT);
     k_work_submit(&peripheral_batt_lvl_work);
 #endif // IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_CENTRAL_BATTERY_LEVEL_FETCHING)
+    raise_zmk_split_peripheral_status_changed(
+        (struct zmk_split_peripheral_status_changed){.connected = false});
 
     err = release_peripheral_slot_for_conn(conn);
 
@@ -828,47 +842,85 @@ int zmk_split_bt_invoke_behavior(uint8_t source, struct zmk_behavior_binding *bi
     return split_bt_invoke_behavior_payload(wrapper);
 }
 
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
+K_THREAD_STACK_DEFINE(split_central_data_xfer_q_stack,
+                      CONFIG_ZMK_SPLIT_BLE_CENTRAL_DATA_XFER_STACK_SIZE);
 
-static zmk_hid_indicators_t hid_indicators = 0;
+struct k_work_q split_central_data_xfer_q;
 
-static void split_central_update_indicators_callback(struct k_work *work) {
+K_MSGQ_DEFINE(zmk_split_central_data_xfer_msgq, sizeof(struct zmk_split_data_xfer_data),
-    zmk_hid_indicators_t indicators = hid_indicators;
+              CONFIG_ZMK_SPLIT_BLE_CENTRAL_DATA_XFER_QUEUE_SIZE, 2);
-    for (int i = 0; i < ZMK_SPLIT_BLE_PERIPHERAL_COUNT; i++) {
+
+void split_central_data_xfer_callback(struct k_work *work) {
+    struct zmk_split_data_xfer_data payload;
+
+    while (k_msgq_get(&zmk_split_central_data_xfer_msgq, &payload, K_NO_WAIT) == 0) {
+        for (uint8_t i = 0; i < ZMK_SPLIT_BLE_PERIPHERAL_COUNT; i++) {
             if (peripherals[i].state != PERIPHERAL_SLOT_STATE_CONNECTED) {
+                LOG_ERR("Source not connected");
                 continue;
             }
 
-        if (peripherals[i].update_hid_indicators == 0) {
+            if (!peripherals[i].data_xfer_handle) {
-            // It appears that sometimes the peripheral is considered connected
+                LOG_ERR("Handle not discovered");
-            // before the GATT characteristics have been discovered. If this is
-            // the case, the update_hid_indicators handle will not yet be set.
                 continue;
             }
 
             int err = bt_gatt_write_without_response(peripherals[i].conn,
-                                                 peripherals[i].update_hid_indicators, &indicators,
+                                                     peripherals[i].data_xfer_handle, &payload,
-                                                 sizeof(indicators), true);
+                                                     sizeof(struct zmk_split_data_xfer_data), true);
 
             if (err) {
-            LOG_ERR("Failed to write HID indicator characteristic (err %d)", err);
+                LOG_ERR("Failed to write the data transfer characteristic (err %d)", err);
+            }
         }
     }
 }
 
-static K_WORK_DEFINE(split_central_update_indicators, split_central_update_indicators_callback);
+K_WORK_DEFINE(split_central_data_xfer_work, split_central_data_xfer_callback);
 
-int zmk_split_bt_update_hid_indicator(zmk_hid_indicators_t indicators) {
+static int split_bt_data_xfer_payload(struct zmk_split_data_xfer_data payload) {
-    hid_indicators = indicators;
+    LOG_DBG("");
-    return k_work_submit_to_queue(&split_central_split_run_q, &split_central_update_indicators);
+
+    int err = k_msgq_put(&zmk_split_central_data_xfer_msgq, &payload, K_MSEC(100));
+    if (err) {
+        switch (err) {
+        case -EAGAIN: {
+            LOG_WRN("Consumer message queue full, popping first message and queueing again");
+            struct zmk_split_data_xfer_data discarded_report;
+            k_msgq_get(&zmk_split_central_data_xfer_msgq, &discarded_report, K_NO_WAIT);
+            return split_bt_data_xfer_payload(payload);
+        }
+        default:
+            LOG_WRN("Failed to queue data to send (%d)", err);
+            return err;
+        }
+    }
+
+    k_work_submit_to_queue(&split_central_data_xfer_q, &split_central_data_xfer_work);
+
+    return 0;
+};
+
+int zmk_split_central_send_data(enum data_tag tag, uint8_t size, uint8_t *data) {
+    if (size > ZMK_SPLIT_DATA_XFER_MAX_LEN) {
+        LOG_ERR("Payload too large. Size: %d", size);
+        return -EFBIG;
+    }
+    struct zmk_split_data_xfer_data payload;
+    payload.data_tag = tag;
+    payload.data_size = size;
+    memcpy(payload.data, data, size);
+    LOG_HEXDUMP_DBG(&payload, sizeof(struct zmk_split_data_xfer_data), "sending :");
+    return split_bt_data_xfer_payload(payload);
 }
 
-#endif // IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
+int zmk_split_bt_central_init(void) {
-
-static int zmk_split_bt_central_init(void) {
     k_work_queue_start(&split_central_split_run_q, split_central_split_run_q_stack,
                        K_THREAD_STACK_SIZEOF(split_central_split_run_q_stack),
                        CONFIG_ZMK_BLE_THREAD_PRIORITY, NULL);
+    k_work_queue_start(&split_central_data_xfer_q, split_central_data_xfer_q_stack,
+                       K_THREAD_STACK_SIZEOF(split_central_data_xfer_q_stack),
+                       CONFIG_ZMK_BLE_THREAD_PRIORITY, NULL);
     bt_conn_cb_register(&conn_callbacks);
 
     return IS_ENABLED(CONFIG_ZMK_BLE_CLEAR_BONDS_ON_START) ? 0 : start_scanning();

app/src/split/bluetooth/service.c

@@ -22,12 +22,9 @@ LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 #include <zmk/split/bluetooth/uuid.h>
 #include <zmk/split/bluetooth/service.h>
 
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
-#include <zmk/events/hid_indicators_changed.h>
-#endif // IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
-
 #include <zmk/events/sensor_event.h>
 #include <zmk/sensors.h>
+#include <zmk/events/split_data_xfer_event.h>
 
 #if ZMK_KEYMAP_HAS_SENSORS
 static struct sensor_event last_sensor_event;
@@ -49,6 +46,7 @@ static uint8_t num_of_positions = ZMK_KEYMAP_LEN;
 static uint8_t position_state[POS_STATE_LEN];
 
 static struct zmk_split_run_behavior_payload behavior_run_payload;
+static struct zmk_split_data_xfer_data data_xfer_payload;
 
 static ssize_t split_svc_pos_state(struct bt_conn *conn, const struct bt_gatt_attr *attrs,
                                    void *buf, uint16_t len, uint16_t offset) {
@@ -101,6 +99,32 @@ static ssize_t split_svc_run_behavior(struct bt_conn *conn, const struct bt_gatt
     return len;
 }
 
+static void split_svc_data_xfer_callback(struct k_work *work) {
+    LOG_DBG("Size correct, raising event");
+    struct zmk_split_data_xfer_event event;
+    memcpy(&event.data_xfer, &data_xfer_payload, sizeof(struct zmk_split_data_xfer_data));
+    raise_zmk_split_data_xfer_event(event);
+}
+
+static K_WORK_DEFINE(split_svc_data_xfer_work, split_svc_data_xfer_callback);
+
+static ssize_t split_svc_data_xfer(struct bt_conn *conn, const struct bt_gatt_attr *attrs,
+                                   const void *buf, uint16_t len, uint16_t offset, uint8_t flags) {
+    uint16_t end_addr = offset + len;
+
+    LOG_DBG("offset %d len %d", offset, len);
+    LOG_HEXDUMP_DBG(buf, len, "Receiving :");
+
+    // If whole packet transferred correctly
+    if ((end_addr == sizeof(struct zmk_split_data_xfer_data))) {
+        // Raise new data transfer event with received data
+        memcpy(&data_xfer_payload + offset, buf, len);
+        k_work_submit(&split_svc_data_xfer_work);
+    }
+
+    return len;
+}
+
 static ssize_t split_svc_num_of_positions(struct bt_conn *conn, const struct bt_gatt_attr *attrs,
                                           void *buf, uint16_t len, uint16_t offset) {
     return bt_gatt_attr_read(conn, attrs, buf, len, offset, attrs->user_data, sizeof(uint8_t));
@@ -110,34 +134,6 @@ static void split_svc_pos_state_ccc(const struct bt_gatt_attr *attr, uint16_t va
     LOG_DBG("value %d", value);
 }
 
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
-
-static zmk_hid_indicators_t hid_indicators = 0;
-
-static void split_svc_update_indicators_callback(struct k_work *work) {
-    LOG_DBG("Raising HID indicators changed event: %x", hid_indicators);
-    raise_zmk_hid_indicators_changed(
-        (struct zmk_hid_indicators_changed){.indicators = hid_indicators});
-}
-
-static K_WORK_DEFINE(split_svc_update_indicators_work, split_svc_update_indicators_callback);
-
-static ssize_t split_svc_update_indicators(struct bt_conn *conn, const struct bt_gatt_attr *attr,
-                                           const void *buf, uint16_t len, uint16_t offset,
-                                           uint8_t flags) {
-    if (offset + len > sizeof(zmk_hid_indicators_t)) {
-        return BT_GATT_ERR(BT_ATT_ERR_INVALID_OFFSET);
-    }
-
-    memcpy((uint8_t *)&hid_indicators + offset, buf, len);
-
-    k_work_submit(&split_svc_update_indicators_work);
-
-    return len;
-}
-
-#endif // IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
-
 BT_GATT_SERVICE_DEFINE(
     split_svc, BT_GATT_PRIMARY_SERVICE(BT_UUID_DECLARE_128(ZMK_SPLIT_BT_SERVICE_UUID)),
     BT_GATT_CHARACTERISTIC(BT_UUID_DECLARE_128(ZMK_SPLIT_BT_CHAR_POSITION_STATE_UUID),
@@ -147,6 +143,9 @@ BT_GATT_SERVICE_DEFINE(
     BT_GATT_CHARACTERISTIC(BT_UUID_DECLARE_128(ZMK_SPLIT_BT_CHAR_RUN_BEHAVIOR_UUID),
                            BT_GATT_CHRC_WRITE_WITHOUT_RESP, BT_GATT_PERM_WRITE_ENCRYPT, NULL,
                            split_svc_run_behavior, &behavior_run_payload),
+    BT_GATT_CHARACTERISTIC(BT_UUID_DECLARE_128(ZMK_SPLIT_BT_CHAR_DATA_XFER_UUID),
+                           BT_GATT_CHRC_WRITE_WITHOUT_RESP, BT_GATT_PERM_WRITE_ENCRYPT, NULL,
+                           split_svc_data_xfer, NULL),
     BT_GATT_DESCRIPTOR(BT_UUID_NUM_OF_DIGITALS, BT_GATT_PERM_READ, split_svc_num_of_positions, NULL,
                        &num_of_positions),
 #if ZMK_KEYMAP_HAS_SENSORS
@@ -155,11 +154,6 @@ BT_GATT_SERVICE_DEFINE(
                            split_svc_sensor_state, NULL, &last_sensor_event),
     BT_GATT_CCC(split_svc_sensor_state_ccc, BT_GATT_PERM_READ_ENCRYPT | BT_GATT_PERM_WRITE_ENCRYPT),
 #endif /* ZMK_KEYMAP_HAS_SENSORS */
-#if IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
-    BT_GATT_CHARACTERISTIC(BT_UUID_DECLARE_128(ZMK_SPLIT_BT_UPDATE_HID_INDICATORS_UUID),
-                           BT_GATT_CHRC_WRITE_WITHOUT_RESP, BT_GATT_PERM_WRITE_ENCRYPT, NULL,
-                           split_svc_update_indicators, NULL),
-#endif // IS_ENABLED(CONFIG_ZMK_SPLIT_PERIPHERAL_HID_INDICATORS)
 );
 
 K_THREAD_STACK_DEFINE(service_q_stack, CONFIG_ZMK_SPLIT_BLE_PERIPHERAL_STACK_SIZE);