fix(bluetooth): Remove identity, minimal `bt`.

* Simplify the `bt` behavior to one current command
  `BT_CLEAR_BONDS_CMD`.
* Simplify BLE code for split and non-split keyboards.
* Remove keymap processing from split peripheral side.

app/CMakeLists.txt

@@ -41,9 +41,7 @@ target_sources(app PRIVATE src/behaviors/behavior_toggle_layer.c)
 target_sources(app PRIVATE src/behaviors/behavior_transparent.c)
 target_sources(app PRIVATE src/behaviors/behavior_none.c)
 target_sources(app PRIVATE src/behaviors/behavior_sensor_rotate_key_press.c)
-if(NOT CONFIG_ZMK_BLE_SPLIT_PERIPHERAL)
-  target_sources(app PRIVATE src/keymap.c)
-endif()
+target_sources(app PRIVATE src/keymap.c)
 target_sources_ifdef(CONFIG_ZMK_RGB_UNDERGLOW app PRIVATE src/behaviors/behavior_rgb_underglow.c)
 target_sources_ifdef(CONFIG_ZMK_BLE app PRIVATE src/behaviors/behavior_bt.c)
 target_sources_ifdef(CONFIG_ZMK_BLE app PRIVATE src/ble.c)

app/Kconfig

@@ -40,6 +40,8 @@ menuconfig ZMK_BLE
 	select BT_PERIPHERAL
 	select BT_GATT_DIS
 	select BT_GATT_BAS
+	select BT_SETTINGS
+	select SETTINGS
 
 if ZMK_BLE
 
@@ -47,12 +49,6 @@ config ZMK_BLE_INIT_PRIORITY
 	int "Init Priority"
 	default 50
 	
-config SETTINGS
-	default y
-
-config BT_SETTINGS
-	default y
-	
 config SYSTEM_WORKQUEUE_STACK_SIZE
 	default 2048
 
@@ -144,21 +140,6 @@ endif
 
 endmenu
 
-
-if ZMK_BLE && !ZMK_SPLIT_BLE
-
-config BT_ID_MAX
-	default 5
-
-config BT_MAX_PAIRED
-	default 5
-
-# Used to update the name to include the identity used
-config BT_DEVICE_NAME_DYNAMIC
-	default y
-
-endif
-
 config ZMK_KSCAN_MOCK_DRIVER
 	bool "Enable mock kscan driver to simulate key presses"
 	default n

app/include/dt-bindings/zmk/bt.h

@@ -4,14 +4,11 @@
  * SPDX-License-Identifier: MIT
  */
 
-#define BT_RST_CMD       0
-#define BT_IDENT_NEXT_CMD 1
-#define BT_IDENT_PREV_CMD 2
-#define BT_IDENT_SEL_CMD  3
-#define BT_IDENT_CLR_CMD  4
+#define BT_CLEAR_BONDS_CMD       0
 
-#define BT_RST       BT_RST_CMD 0
-#define BT_IDENT_NEXT BT_IDENT_NEXT_CMD 0
-#define BT_IDENT_PREV BT_IDENT_PREV_CMD 0
-#define BT_IDENT_SEL  BT_IDENT_SEL_CMD
-#define BT_IDENT_CLR  BT_IDENT_CLR_CMD 0
+/*
+Note: Some future commands will include additional parameters, so we
+defines these aliases up front.
+*/
+
+#define BT_CLEAR_BONDS       BT_CLEAR_BONDS_CMD 0

app/include/zmk/ble.h

@@ -9,13 +9,8 @@
 #include <bluetooth/addr.h>
 #include <zmk/keys.h>
 
-int zmk_ble_adv_pause();
-int zmk_ble_adv_resume();
 
-int zmk_ble_identity_clear();
-int zmk_ble_identity_next();
-int zmk_ble_identity_prev();
-int zmk_ble_identity_select(u8_t index);
+int zmk_ble_clear_bonds();
 
 int zmk_ble_unpair_all();
 bool zmk_ble_handle_key_user(struct zmk_key_event *key_event);

app/src/behaviors/behavior_bt.c

@@ -22,18 +22,10 @@ static int on_keymap_binding_pressed(struct device *dev, u32_t position, u32_t c
 {
     switch (command)
     {
-    case BT_RST_CMD:
-        return zmk_ble_unpair_all();
-    case BT_IDENT_CLR_CMD:
-        return zmk_ble_identity_clear();
-#if CONFIG_BT_ID_MAX != 1
-    case BT_IDENT_NEXT_CMD:
-        return zmk_ble_identity_next();
-    case BT_IDENT_PREV_CMD:
-        return zmk_ble_identity_prev();
-    case BT_IDENT_SEL_CMD:
-        return zmk_ble_identity_select(arg);
-#endif /* BT_ID_MAX != 1 */
+    case BT_CLEAR_BONDS_CMD:
+        return zmk_ble_clear_bonds();
+    default:
+        LOG_ERR("Unknown BT command: %d", command);
     }
 
     return -ENOTSUP;

app/src/ble.c

@@ -82,8 +82,6 @@ static const struct bt_data zmk_ble_ad[] = {
 #endif
 };
 
-#define IDENTITY_COUNT CONFIG_BT_ID_MAX
-
 #if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
 
 static bt_addr_le_t peripheral_addr;
@@ -91,8 +89,6 @@ static bt_addr_le_t peripheral_addr;
 #endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL) */
 
 
-static u8_t active_identity = 0;
-
 int zmk_ble_adv_pause()
 {
     int err = bt_le_adv_stop();
@@ -106,7 +102,7 @@ int zmk_ble_adv_pause()
 
 int zmk_ble_adv_resume()
 {
-    struct bt_le_adv_param *adv_params = ZMK_ADV_PARAMS(active_identity);
+    struct bt_le_adv_param *adv_params = ZMK_ADV_PARAMS(BT_ID_DEFAULT);
 
     LOG_DBG("");
     int err = bt_le_adv_start(adv_params, zmk_ble_ad, ARRAY_SIZE(zmk_ble_ad), NULL, 0);
@@ -131,62 +127,6 @@ static void disconnect_host_connection(struct bt_conn *conn, void *arg)
     bt_conn_disconnect(conn, BT_HCI_ERR_LOCALHOST_TERM_CONN);
 };
 
-static int activate_profile(u8_t index)
-{
-    int err;
-    
-    if (index >= IDENTITY_COUNT) {
-        return -EINVAL;
-    }
-
-    if (active_identity != index) {
-        LOG_DBG("Persisting new active identity");
-        active_identity = index;
-
-#if IS_ENABLED(CONFIG_SETTINGS)
-        err = settings_save_one("ble/active_identity", &active_identity, sizeof(u8_t));
-        if (err) {
-            LOG_WRN("Failed to persist active_identity (err %d)", err);
-        }
-#endif
-
-#if IS_ENABLED(CONFIG_BT_DEVICE_NAME_DYNAMIC)
-        char name[CONFIG_BT_DEVICE_NAME_MAX];
-        snprintf(name, sizeof(name), "%s (Profile %d)", CONFIG_ZMK_KEYBOARD_NAME, active_identity + 1);
-        bt_set_name(name);
-#endif /* IS_ENABLED(CONFIG_BT_DEVICE_NAME_DYNAMIC) */
-    }
-
-    return zmk_ble_adv_resume();
-};
-
-static int deactivate_profile(u8_t index)
-{
-    int err = zmk_ble_adv_pause();
-    if (err) {
-        LOG_WRN("Failed to pause advertising %d", err);
-    }
-
-    bt_conn_foreach(BT_CONN_TYPE_ALL, disconnect_host_connection, NULL);
-
-    return 0;
-};
-
-int zmk_ble_identity_select(u8_t index)
-{
-    LOG_DBG("index %d", index);
-    if (index >= IDENTITY_COUNT) {
-        return -EINVAL;
-    }
-
-    int err = deactivate_profile(active_identity);
-    if (err) {
-        LOG_WRN("Failed to deactivate profile");
-        return err;
-    }
-
-    return activate_profile(index);
-};
 
 static void unpair_non_peripheral_bonds(const struct bt_bond_info *info, void *user_data) {
     char addr[BT_ADDR_LE_STR_LEN];
@@ -200,34 +140,19 @@ static void unpair_non_peripheral_bonds(const struct bt_bond_info *info, void *u
 #endif /* IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL) */
 
     LOG_DBG("Unpairing %s", log_strdup(addr));
-    bt_unpair(active_identity, &info->addr);
+    bt_unpair(BT_ID_DEFAULT, &info->addr);
 }
 
-int zmk_ble_identity_clear()
+int zmk_ble_clear_bonds()
 {
     LOG_DBG("");
-    int err = deactivate_profile(active_identity);
-    if (err) {
-        return err;
-    }
     
-    bt_foreach_bond(active_identity, unpair_non_peripheral_bonds, NULL);
+    bt_conn_foreach(BT_ID_DEFAULT, disconnect_host_connection, NULL);
+    bt_foreach_bond(BT_ID_DEFAULT, unpair_non_peripheral_bonds, NULL);
 
-    return activate_profile(active_identity);
+    return 0;
 };
 
-int zmk_ble_identity_next()
-{
-    LOG_DBG("active_identity %d IDENTITY_COUNT %d", active_identity, IDENTITY_COUNT);
-    return zmk_ble_identity_select((active_identity + 1) % IDENTITY_COUNT);
-}
-
-int zmk_ble_identity_prev()
-{
-    LOG_DBG("");
-    return zmk_ble_identity_select((active_identity + IDENTITY_COUNT - 1) % IDENTITY_COUNT);
-}
-
 #if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
 
 void zmk_ble_set_peripheral_addr(bt_addr_le_t *addr)
@@ -246,19 +171,8 @@ static int ble_profiles_handle_set(const char *name, size_t len, settings_read_c
 
     LOG_DBG("Setting BLE value %s", log_strdup(name));
 
-    if (settings_name_steq(name, "active_identity", &next) && !next) {
-        if (len != sizeof(active_identity)) {
-            return -EINVAL;
-        }
-
-        int err = read_cb(cb_arg, &active_identity, sizeof(active_identity));
-        if (err <= 0) {
-            LOG_ERR("Failed to handle profile from settings (err %d)", err);
-            return err;
-        }
-        LOG_DBG("Loaded active identity %d", active_identity);
 #if IS_ENABLED(CONFIG_ZMK_SPLIT_BLE_ROLE_CENTRAL)
-    } else if (settings_name_steq(name, "peripheral_address", &next) && !next) {
+    if (settings_name_steq(name, "peripheral_address", &next) && !next) {
         if (len != sizeof(bt_addr_le_t)) {
             return -EINVAL;
         }
@@ -268,8 +182,8 @@ static int ble_profiles_handle_set(const char *name, size_t len, settings_read_c
             LOG_ERR("Failed to handle peripheral address from settings (err %d)", err);
             return err;
         }
-#endif
     }
+#endif
 
     return 0;
 };
@@ -318,6 +232,8 @@ static void disconnected(struct bt_conn *conn, u8_t reason)
     if (bt_addr_le_cmp(&peripheral_addr, BT_ADDR_LE_ANY) && bt_addr_le_cmp(&peripheral_addr, bt_conn_get_dst(conn))) {
         zmk_ble_adv_resume();
     }
+#else 
+    zmk_ble_adv_resume();
 #endif
 }
 
@@ -404,42 +320,12 @@ static void zmk_ble_ready(int err)
         return;
     }
 
-    zmk_ble_identity_select(active_identity);
+    zmk_ble_adv_resume();
 }
 
-#if CONFIG_BT_ID_MAX != 1
-static int initialize_identities()
-{
-    bt_addr_le_t addrs[CONFIG_BT_ID_MAX];
-    size_t count = CONFIG_BT_ID_MAX;
-
-    LOG_DBG("");
-    bt_id_get(addrs, &count);
-
-    for (int i = 0; i < count; i++) {
-        char addr[BT_ADDR_LE_STR_LEN];
-        bt_addr_le_to_str(&addrs[i], addr, sizeof(addr));
-        LOG_DBG("Existing identity %s", log_strdup(addr));
-    }
-
-    for (int i = count; i < CONFIG_BT_ID_MAX; i++) {
-        LOG_DBG("Initializing identity %d", i);
-        int id = bt_id_create(NULL, NULL);
-        if (id < 0) {
-            LOG_ERR("Failed to create new identity with id %d", i);
-            return id;
-        }
-    }
-
-    return 0;
-};
-#endif /* CONFIG_BT_ID_MAX != 1 */
-
 static int zmk_ble_init(struct device *_arg)
 {
-    int err;
-
-    err = bt_enable(NULL);
+    int err = bt_enable(NULL);
 
     if (err)
     {
@@ -460,10 +346,6 @@ static int zmk_ble_init(struct device *_arg)
 
 #endif
 
-#if CONFIG_BT_ID_MAX != 1
-    initialize_identities();
-#endif /* CONFIG_BT_ID_MAX != 1 */
-
     bt_conn_cb_register(&conn_callbacks);
     bt_conn_auth_cb_register(&zmk_ble_auth_cb_display);
 
@@ -474,13 +356,17 @@ static int zmk_ble_init(struct device *_arg)
 
 int zmk_ble_unpair_all()
 {
-    LOG_DBG("");
-    int err = bt_unpair(BT_ID_DEFAULT, NULL);
-    if (err) {
-        LOG_ERR("Failed to unpair devices (err %d)", err);
+    int resp = 0;
+    for (int i = BT_ID_DEFAULT; i < CONFIG_BT_ID_MAX; i++) {
+
+        int err = bt_unpair(BT_ID_DEFAULT, NULL);
+        if (err) {
+            resp = err;
+            LOG_ERR("Failed to unpair devices (err %d)", err);
+        }
     }
 
-    return err;
+    return resp;
 };
 
 bool zmk_ble_handle_key_user(struct zmk_key_event *key_event)

app/src/split_listener.c

@@ -21,6 +21,7 @@ LOG_MODULE_DECLARE(zmk, CONFIG_ZMK_LOG_LEVEL);
 
 int split_listener(const struct zmk_event_header *eh)
 {
+  LOG_DBG("");
   if (is_position_state_changed(eh)) {
     const struct position_state_changed *ev = cast_position_state_changed(eh);
     if (ev->state) {

docs/docs/behavior/bluetooth.md

@@ -6,7 +6,8 @@ sidebar_label: Bluetooth
 ## Summary
 
 The bluetooth behavior allows management of various settings and states related to the bluetooth connection(s)
-between the keyboard and the host.
+between the keyboard and the host. As of right now, there is only one such action support, but in the future
+more will be added.
 
 ## Bluetooth Command Defines
 
@@ -17,31 +18,20 @@ which is added at the top of the keymap file:
 #include <dt-bindings/zmk/bt.h>
 ```
 
-This will allow you to reference the actions defined in this header such as `BT_IDENT_CLR_CMD`.
+This will allow you to reference the actions defined in this header such as `BT_CLEAR_BONDS_CMD`.
 
 Here is a table describing the command for each define:
 
-| Define              | Action                                                |
-| ------------------- | ----------------------------------------------------- |
-| `BT_IDENT_CLR_CMD`  | Clear paired keyboards (for the current identity)[^1] |
-| `BT_IDENT_NEXT_CMD` | Switch to the next identity[^1]                       |
-| `BT_IDENT_PREV_CMD` | Switch to the previous identity                       |
-| `BT_IDENT_SEL_CMD`  | Switch to a specific numbered identity                |
-| `BT_RST_CMD`        | Hard reset of all bluetooth bonds                     |
+| Define               | Action                                                    |
+| -------------------- | --------------------------------------------------------- |
+| `BT_CLEAR_BONDS_CMD` | Clear bond information between the keyboard and host [^1] |
 
-Because the `BT_IDENT_SEL_CMD` command takes an additional parameter, the numeric index of the identity to select, _all_ the commands for the bluetooth behavior must take that additional parameter, and ignore the value. To make this easier,
-there are alias defines that add those default parameters for you:
+Because future bluetooth commands will take an additional parameter, it is recommended to use
+the following alias in your keymap to avoid having to change it later.
 
-| Define          | Action                                                                                  |
-| --------------- | --------------------------------------------------------------------------------------- |
-| `BT_IDENT_CLR`  | Alias for `BT_IDENT_CLR_CMD 0` to clear paired keyboards (for the current identity)[^1] |
-| `BT_IDENT_NEXT` | Alias for `BT_IDENT_NEXT_CMD 0` to switch to the next identity[^1]                      |
-| `BT_IDENT_PREV` | Alias for `BT_IDENT_PREV_CMD 0` to switch to the previous identity                      |
-| `BT_IDENT_SEL`  | Alias for `BT_IDENT_SEL_CMD` to switch to a specific numbered identity                  |
-| `BT_RST`        | Alias for `BT_RST_CMD 0` to reset all bonds[^2]                                         |
-
-[^1]: Multiple keyboard identities/profiles is only support on non-split keyboards as of this time.
-[^2]: This may interrupt pairing between both halves of a split keyboard. For split keyboards, it is preferred to use the [/docs/bond-reset] combo to clear bonds on both devices
+| Define           | Action                                                                 |
+| ---------------- | ---------------------------------------------------------------------- |
+| `BT_CLEAR_BONDS` | Alias for `BT_CLEAR_BONDS_CMD 0` to clear the bond to the current host |
 
 ## Bluetooth Behavior
 
@@ -50,33 +40,13 @@ The bluetooth behavior completes an bluetooth action given on press.
 ### Behavior Binding
 
 - Reference: `&bt`
-- Parameter #1: The bluetooth command define, e.g. `BT_IDENT_CLR_CMD` or `BT_RST_CMD`
-- Parameter #2: The parameter for the command, when used to identify an identity/profile to select, e.g. `0`
+- Parameter #1: The bluetooth command define, e.g. `BT_CLEAR_BONDS_CMD`
+- Parameter #2: (Reserved for future bluetooth command types)
 
 ### Examples
 
 1. Behavior to clear the paired host:
 
    ```
-   &bt BT_IDENT_CLR
-   ```
-
-1. Behavior to hard reset all bonded devices[^2]:
-
-   ```
-   &bt BT_IDENT_CLR
-   ```
-
-Examples for non-split keyboards with multiple identities:
-
-1. Behavior to switch to the next identity:
-
-   ```
-   &bt BT_IDENT_NEXT
-   ```
-
-1. Behavior to switch to the specific numbered identity:
-
-   ```
-   &bt BT_IDENT_SEL 1
+   &bt BT_CLEAR_BONDS
    ```