ble_mesh: add low power node api and event

components/bt/esp_ble_mesh/Kconfig.in

@@ -446,6 +446,7 @@ if BLE_MESH
 
     config BLE_MESH_LOW_POWER
         bool "Support for Low Power features"
+        select BLE_MESH_NODE
         help
             Enable this option to operate as a Low Power Node. If low power consumption
             is required by a node, this option should be enabled. And once the node
@@ -456,7 +457,7 @@ if BLE_MESH
 
         config BLE_MESH_LPN_ESTABLISHMENT
             bool "Perform Friendship establishment using low power"
-            default y
+            default n
             help
                 Perform the Friendship establishment using low power with the help of a
                 reduced scan duty cycle. The downside of this is that the node may miss
@@ -468,7 +469,7 @@ if BLE_MESH
 
         config BLE_MESH_LPN_AUTO
             bool "Automatically start looking for Friend nodes once provisioned"
-            default y
+            default n
             help
                 Once provisioned, automatically enable LPN functionality and start looking
                 for Friend nodes. If this option is disabled LPN mode needs to be manually
@@ -487,8 +488,8 @@ if BLE_MESH
                 before starting to look for Friend nodes.
 
         config BLE_MESH_LPN_RETRY_TIMEOUT
-            int "Retry timeout for Friend Requests"
+            int "Retry timeout for Friend requests"
-            default 8
+            default 6
             range 1 3600
             help
                 Time in seconds between Friend Requests, if a previous Friend Request did
@@ -569,7 +570,7 @@ if BLE_MESH
         config BLE_MESH_LPN_GROUPS
             int "Number of groups the LPN can subscribe to"
             range 0 16384
-            default 8
+            default 2
             help
                 Maximum number of groups to which the LPN can subscribe.
 

components/bt/esp_ble_mesh/api/core/esp_ble_mesh_low_power_api.c

@@ -15,10 +15,51 @@
 #include <stdint.h>
 
 #include "btc/btc_task.h"
-#include "btc/btc_manage.h"
 
 #include "esp_err.h"
 
 #include "btc_ble_mesh_prov.h"
 #include "esp_ble_mesh_defs.h"
 
+esp_err_t esp_ble_mesh_lpn_enable(void)
+{
+    btc_msg_t msg = {0};
+
+    ESP_BLUEDROID_STATUS_CHECK(ESP_BLUEDROID_STATUS_ENABLED);
+
+    msg.sig = BTC_SIG_API_CALL;
+    msg.pid = BTC_PID_PROV;
+    msg.act = BTC_BLE_MESH_ACT_LPN_ENABLE;
+
+    return (btc_transfer_context(&msg, NULL, 0, NULL) == BT_STATUS_SUCCESS ? ESP_OK : ESP_FAIL);
+}
+
+esp_err_t esp_ble_mesh_lpn_disable(bool force)
+{
+    btc_ble_mesh_prov_args_t arg = {0};
+    btc_msg_t msg = {0};
+
+    ESP_BLUEDROID_STATUS_CHECK(ESP_BLUEDROID_STATUS_ENABLED);
+
+    msg.sig = BTC_SIG_API_CALL;
+    msg.pid = BTC_PID_PROV;
+    msg.act = BTC_BLE_MESH_ACT_LPN_DISABLE;
+
+    arg.lpn_disable.force = force;
+
+    return (btc_transfer_context(&msg, &arg, sizeof(btc_ble_mesh_prov_args_t), NULL)
+            == BT_STATUS_SUCCESS ? ESP_OK : ESP_FAIL);
+}
+
+esp_err_t esp_ble_mesh_lpn_poll(void)
+{
+    btc_msg_t msg = {0};
+
+    ESP_BLUEDROID_STATUS_CHECK(ESP_BLUEDROID_STATUS_ENABLED);
+
+    msg.sig = BTC_SIG_API_CALL;
+    msg.pid = BTC_PID_PROV;
+    msg.act = BTC_BLE_MESH_ACT_LPN_POLL;
+
+    return (btc_transfer_context(&msg, NULL, 0, NULL) == BT_STATUS_SUCCESS ? ESP_OK : ESP_FAIL);
+}

components/bt/esp_ble_mesh/api/core/include/esp_ble_mesh_low_power_api.h

@@ -17,4 +17,38 @@
 
 #include "esp_ble_mesh_defs.h"
 
+/**
+ * @brief       Enable BLE Mesh device LPN functionality.
+ *
+ * @note        This API enables LPN functionality. Once called, the proper
+ *              Friend Request will be sent.
+ *
+ * @return      ESP_OK on success or error code otherwise.
+ *
+ */
+esp_err_t esp_ble_mesh_lpn_enable(void);
+
+/**
+ * @brief       Disable BLE Mesh device LPN functionality.
+ *
+ * @param[in]   force: when disabling LPN functionality, use this flag to indicate
+ *                     whether directly clear corresponding information or just
+ *                     send friend clear to disable it if friendship has already
+ *                     been established.
+ *
+ * @return      ESP_OK on success or error code otherwise.
+ *
+ */
+esp_err_t esp_ble_mesh_lpn_disable(bool force);
+
+/**
+ * @brief       LPN tries to poll messages from the Friend Node.
+ *
+ * @note        Once called, Friend Poll will be sent to the Friend Node.
+ *
+ * @return      ESP_OK on success or error code otherwise.
+ *
+ */
+esp_err_t esp_ble_mesh_lpn_poll(void);
+
 #endif /* _ESP_BLE_MESH_LOW_POWER_API_H_ */

components/bt/esp_ble_mesh/api/esp_ble_mesh_defs.h

@@ -1241,6 +1241,11 @@ typedef enum {
     ESP_BLE_MESH_SET_FAST_PROV_INFO_COMP_EVT,                   /*!< Set fast provisioning information (e.g. unicast address range, net_idx, etc.) completion event */
     ESP_BLE_MESH_SET_FAST_PROV_ACTION_COMP_EVT,                 /*!< Set fast provisioning action completion event */
     ESP_BLE_MESH_HEARTBEAT_MESSAGE_RECV_EVT,                    /*!< Receive Heartbeat message event */
+    ESP_BLE_MESH_LPN_ENABLE_COMP_EVT,                           /*!< Enable Low Power Node completion event */
+    ESP_BLE_MESH_LPN_DISABLE_COMP_EVT,                          /*!< Disable Low Power Node completion event */
+    ESP_BLE_MESH_LPN_POLL_COMP_EVT,                             /*!< Low Power Node send Friend Poll completion event */
+    ESP_BLE_MESH_LPN_FRIENDSHIP_ESTABLISH_EVT,                  /*!< Low Power Node establishes friendship event */
+    ESP_BLE_MESH_LPN_FRIENDSHIP_TERMINATE_EVT,                  /*!< Low Power Node terminates friendship event */
     ESP_BLE_MESH_PROV_EVT_MAX,
 } esp_ble_mesh_prov_cb_event_t;
 
@@ -1531,6 +1536,36 @@ typedef union {
         uint8_t  hops;                          /*!< Heartbeat hops (InitTTL - RxTTL + 1) */
         uint16_t feature;                       /*!< Bit field of currently active features of the node */
     } heartbeat_msg_recv;                       /*!< Event parameter of ESP_BLE_MESH_HEARTBEAT_MESSAGE_RECV_EVT */
+    /*
+     * @brief ESP_BLE_MESH_LPN_ENABLE_COMP_EVT
+     */
+    struct ble_mesh_lpn_enable_comp_param {
+        int err_code;                           /*!< Indicate the result of enabling LPN functionality */
+    } lpn_enable_comp;                          /*!< Event parameter of ESP_BLE_MESH_LPN_ENABLE_COMP_EVT */
+    /**
+     * @brief ESP_BLE_MESH_LPN_DISABLE_COMP_EVT
+     */
+    struct ble_mesh_lpn_disable_comp_param {
+        int err_code;                           /*!< Indicate the result of disabling LPN functionality */
+    } lpn_disable_comp;                         /*!< Event parameter of ESP_BLE_MESH_LPN_DISABLE_COMP_EVT */
+    /**
+     * @brief ESP_BLE_MESH_LPN_POLL_COMP_EVT
+     */
+    struct ble_mesh_lpn_poll_comp_param {
+        int err_code;                           /*!< Indicate the result of sending Friend Poll */
+    } lpn_poll_comp;                            /*!< Event parameter of ESP_BLE_MESH_LPN_POLL_COMP_EVT */
+    /**
+     * @brief ESP_BLE_MESH_LPN_FRIENDSHIP_ESTABLISH_EVT
+     */
+    struct ble_mesh_lpn_friendship_establish_param {
+        uint16_t friend_addr;                   /*!< Friend Node unicast address */
+    } lpn_friendship_establish;                 /*!< Event parameter of ESP_BLE_MESH_LPN_FRIENDSHIP_ESTABLISH_EVT */
+    /**
+     * @brief ESP_BLE_MESH_LPN_FRIENDSHIP_TERMINATE_EVT
+     */
+    struct ble_mesh_lpn_friendship_terminate_param {
+        uint16_t friend_addr;                   /*!< Friend Node unicast address */
+    } lpn_friendship_terminate;                 /*!< Event parameter of ESP_BLE_MESH_LPN_FRIENDSHIP_TERMINATE_EVT */
 } esp_ble_mesh_prov_cb_param_t;
 
 /**

components/bt/esp_ble_mesh/btc/btc_ble_mesh_prov.c

@@ -567,6 +567,38 @@ static void btc_ble_mesh_reset_cb(void)
     }
     return;
 }
+
+#if CONFIG_BLE_MESH_LOW_POWER
+static void btc_ble_mesh_lpn_cb(u16_t friend_addr, bool established)
+{
+    esp_ble_mesh_prov_cb_param_t mesh_param = {0};
+    btc_msg_t msg = {0};
+    bt_status_t ret;
+    u8_t act;
+
+    LOG_DEBUG("%s", __func__);
+
+    if (established) { 
+        mesh_param.lpn_friendship_establish.friend_addr = friend_addr;
+        act = ESP_BLE_MESH_LPN_FRIENDSHIP_ESTABLISH_EVT;
+    } else {
+        mesh_param.lpn_friendship_terminate.friend_addr = friend_addr;
+        act = ESP_BLE_MESH_LPN_FRIENDSHIP_TERMINATE_EVT;
+    }
+
+    msg.sig = BTC_SIG_API_CB;
+    msg.pid = BTC_PID_PROV;
+    msg.act = act;
+
+    ret = btc_transfer_context(&msg, &mesh_param,
+                               sizeof(esp_ble_mesh_prov_cb_param_t), NULL);
+    if (ret != BT_STATUS_SUCCESS) {
+        LOG_ERROR("%s btc_transfer_context failed", __func__);
+    }
+    return;
+}
+#endif /* CONFIG_BLE_MESH_LOW_POWER */
+
 #endif /* CONFIG_BLE_MESH_NODE */
 
 static void btc_ble_mesh_prov_register_complete_cb(int err_code)
@@ -1224,6 +1256,9 @@ void btc_ble_mesh_prov_call_handler(btc_msg_t *msg)
         arg->mesh_init.prov->link_close_cb = (esp_ble_mesh_cb_t)btc_ble_mesh_link_close_cb;
         arg->mesh_init.prov->complete_cb = (esp_ble_mesh_cb_t)btc_ble_mesh_complete_cb;
         arg->mesh_init.prov->reset_cb = (esp_ble_mesh_cb_t)btc_ble_mesh_reset_cb;
+#if CONFIG_BLE_MESH_LOW_POWER
+        bt_mesh_lpn_set_cb(btc_ble_mesh_lpn_cb);
+#endif /* CONFIG_BLE_MESH_LOW_POWER */
 #endif /* CONFIG_BLE_MESH_NODE */
 #if CONFIG_BLE_MESH_PROVISIONER
         arg->mesh_init.prov->provisioner_prov_read_oob_pub_key = (esp_ble_mesh_cb_t)btc_ble_mesh_provisioner_prov_read_oob_pub_key_cb;
@@ -1440,6 +1475,20 @@ void btc_ble_mesh_prov_call_handler(btc_msg_t *msg)
             bt_mesh_set_fast_prov_action(arg->set_fast_prov_action.action);
         break;
 #endif /* CONFIG_BLE_MESH_FAST_PROV */
+#if CONFIG_BLE_MESH_LOW_POWER
+    case BTC_BLE_MESH_ACT_LPN_ENABLE:
+        act = ESP_BLE_MESH_LPN_ENABLE_COMP_EVT;
+        param.lpn_enable_comp.err_code = bt_mesh_lpn_set(true, false);
+        break;
+    case BTC_BLE_MESH_ACT_LPN_DISABLE:
+        act = ESP_BLE_MESH_LPN_DISABLE_COMP_EVT;
+        param.lpn_disable_comp.err_code = bt_mesh_lpn_set(false, arg->lpn_disable.force);
+        break;
+    case BTC_BLE_MESH_ACT_LPN_POLL:
+        act = ESP_BLE_MESH_LPN_POLL_COMP_EVT;
+        param.lpn_poll_comp.err_code = bt_mesh_lpn_poll();
+        break;
+#endif /* CONFIG_BLE_MESH_LOW_POWER */
     default:
         LOG_WARN("%s, Invalid msg->act %d", __func__, msg->act);
         return;

components/bt/esp_ble_mesh/btc/include/btc_ble_mesh_prov.h

@@ -55,6 +55,9 @@ typedef enum {
     BTC_BLE_MESH_ACT_PROVISIONER_ADD_LOCAL_NET_KEY,
     BTC_BLE_MESH_ACT_SET_FAST_PROV_INFO,
     BTC_BLE_MESH_ACT_SET_FAST_PROV_ACTION,
+    BTC_BLE_MESH_ACT_LPN_ENABLE,
+    BTC_BLE_MESH_ACT_LPN_DISABLE,
+    BTC_BLE_MESH_ACT_LPN_POLL,
 } btc_ble_mesh_prov_act_t;
 
 typedef enum {
@@ -156,6 +159,15 @@ typedef union {
     struct ble_mesh_set_fast_prov_action_args {
         uint8_t action;
     } set_fast_prov_action;
+    struct ble_mesh_lpn_enable_args {
+        /* RFU */
+    } lpn_enable;
+    struct ble_mesh_lpn_disable_args {
+        bool force;
+    } lpn_disable;
+    struct ble_mesh_lpn_poll_args {
+        /* RFU */
+    } lpn_poll;
 } btc_ble_mesh_prov_args_t;
 
 typedef union {

components/bt/esp_ble_mesh/mesh_core/include/mesh_main.h

@@ -555,10 +555,13 @@ bool bt_mesh_iv_update(void);
  *  from a battery power source.
  *
  *  @param enable  true to enable LPN functionality, false to disable it.
+ *  @param force   when disable LPN functionality, use this flag to indicate
+ *                 whether directly clear corresponding information or sending
+ *                 friend clear to disable it.
  *
  *  @return Zero on success or (negative) error code otherwise.
  */
-int bt_mesh_lpn_set(bool enable);
+int bt_mesh_lpn_set(bool enable, bool force);
 
 /** @brief Send out a Friend Poll message.
  *

components/bt/esp_ble_mesh/mesh_core/lpn.c

@@ -55,8 +55,11 @@
 #define POLL_TIMEOUT_MAX(lpn) ((CONFIG_BLE_MESH_LPN_POLL_TIMEOUT * 100) - \
                    REQ_RETRY_DURATION(lpn))
 
-/* Update 4 to 20 for BQB test case MESH/NODE/FRND/LPM/BI-02-C */
+/**
-#define REQ_ATTEMPTS(lpn)     (POLL_TIMEOUT_MAX(lpn) < K_SECONDS(3) ? 2 : 4)
+ * 1. Should use 20 attempts for BQB test case MESH/NODE/FRND/LPM/BI-02-C.
+ * 2. We should use more specific value for each PollTimeout range.
+ */
+#define REQ_ATTEMPTS(lpn)     (POLL_TIMEOUT_MAX(lpn) < K_SECONDS(3) ? 2 : 6)
 
 #define CLEAR_ATTEMPTS        2
 
@@ -72,7 +75,6 @@
 
 static void (*lpn_cb)(u16_t friend_addr, bool established);
 
-#if defined(CONFIG_BLE_MESH_DEBUG_LOW_POWER)
 static const char *state2str(int state)
 {
     switch (state) {
@@ -94,17 +96,16 @@ static const char *state2str(int state)
         return "recv delay";
     case BLE_MESH_LPN_WAIT_UPDATE:
         return "wait update";
+    case BLE_MESH_LPN_OFFER_RECV:
+        return "offer recv";
     default:
         return "(unknown)";
     }
 }
-#endif /* CONFIG_BLE_MESH_DEBUG_LOW_POWER */
 
 static inline void lpn_set_state(int state)
 {
-#if defined(CONFIG_BLE_MESH_DEBUG_LOW_POWER)
     BT_DBG("%s -> %s", state2str(bt_mesh.lpn.state), state2str(state));
-#endif
     bt_mesh.lpn.state = state;
 }
 
@@ -149,6 +150,8 @@ static inline void group_clear(bt_mesh_atomic_t *target, bt_mesh_atomic_t *sourc
 
 static void clear_friendship(bool force, bool disable);
 
+static bool scan_after_clear;
+
 static void friend_clear_sent(int err, void *user_data)
 {
     struct bt_mesh_lpn *lpn = &bt_mesh.lpn;
@@ -156,7 +159,10 @@ static void friend_clear_sent(int err, void *user_data)
     /* We're switching away from Low Power behavior, so permanently
      * enable scanning.
      */
-    bt_mesh_scan_enable();
+    if (scan_after_clear == false) {
+        bt_mesh_scan_enable();
+        scan_after_clear = true;
+    }
 
     lpn->req_attempts++;
 
@@ -261,6 +267,11 @@ static void clear_friendship(bool force, bool disable)
 
     lpn_set_state(BLE_MESH_LPN_ENABLED);
     k_delayed_work_submit(&lpn->timer, FRIEND_REQ_RETRY_TIMEOUT);
+
+    scan_after_clear = false;
+    if (IS_ENABLED(CONFIG_BLE_MESH_LPN_ESTABLISHMENT)) {
+        bt_mesh_scan_disable();
+    }
 }
 
 static void friend_req_sent(u16_t duration, int err, void *user_data)
@@ -269,6 +280,10 @@ static void friend_req_sent(u16_t duration, int err, void *user_data)
 
     if (err) {
         BT_ERR("%s, Sending Friend Request failed (err %d)", __func__, err);
+
+        if (IS_ENABLED(CONFIG_BLE_MESH_LPN_ESTABLISHMENT)) {
+            bt_mesh_scan_enable();
+        }
         return;
     }
 
@@ -322,10 +337,8 @@ static void req_sent(u16_t duration, int err, void *user_data)
 {
     struct bt_mesh_lpn *lpn = &bt_mesh.lpn;
 
-#if defined(CONFIG_BLE_MESH_DEBUG_LOW_POWER)
     BT_DBG("req 0x%02x duration %u err %d state %s",
            lpn->sent_req, duration, err, state2str(lpn->state));
-#endif
 
     if (err) {
         BT_ERR("%s, Sending request failed (err %d)", __func__, err);
@@ -346,6 +359,12 @@ static void req_sent(u16_t duration, int err, void *user_data)
                               LPN_RECV_DELAY - SCAN_LATENCY);
     } else {
         lpn_set_state(BLE_MESH_LPN_OFFER_RECV);
+        /**
+         * Friend Update is replied by Friend Node with TTL set to 0 and Network
+         * Transmit set to 30ms which will cause the packet easy to be missed.
+         * Regarding this situation, here we can reduce the duration of receiving
+         * the first Friend Update.
+         */
         k_delayed_work_submit(&lpn->timer,
                               LPN_RECV_DELAY + duration +
                               lpn->recv_win);
@@ -404,7 +423,7 @@ void bt_mesh_lpn_disable(bool force)
     clear_friendship(force, true);
 }
 
-int bt_mesh_lpn_set(bool enable)
+int bt_mesh_lpn_set(bool enable, bool force)
 {
     struct bt_mesh_lpn *lpn = &bt_mesh.lpn;
 
@@ -442,7 +461,7 @@ int bt_mesh_lpn_set(bool enable)
             k_delayed_work_cancel(&lpn->timer);
             lpn_set_state(BLE_MESH_LPN_DISABLED);
         } else {
-            bt_mesh_lpn_disable(false);
+            bt_mesh_lpn_disable(force);
         }
     }
 
@@ -543,6 +562,10 @@ int bt_mesh_lpn_friend_offer(struct bt_mesh_net_rx *rx,
 
     lpn->counter++;
 
+    if (IS_ENABLED(CONFIG_BLE_MESH_LPN_ESTABLISHMENT)) {
+        bt_mesh_scan_disable();
+    }
+
     return 0;
 }
 
@@ -737,9 +760,7 @@ static void lpn_timeout(struct k_work *work)
 {
     struct bt_mesh_lpn *lpn = &bt_mesh.lpn;
 
-#if defined(CONFIG_BLE_MESH_DEBUG_LOW_POWER)
     BT_DBG("state: %s", state2str(lpn->state));
-#endif
 
     switch (lpn->state) {
     case BLE_MESH_LPN_DISABLED:
@@ -774,9 +795,15 @@ static void lpn_timeout(struct k_work *work)
         k_delayed_work_submit(&lpn->timer, FRIEND_REQ_RETRY_TIMEOUT);
         break;
     case BLE_MESH_LPN_OFFER_RECV:
-        BT_WARN("No Friend Update received after the first Friend Poll");
+        if (lpn->req_attempts < 6) {
-        lpn->sent_req = 0U;
+            BT_WARN("Retrying the first Friend Poll, %d attempts", lpn->req_attempts);
-        send_friend_poll();
+            lpn->sent_req = 0U;
+            send_friend_poll();
+            break;
+        }
+
+        BT_ERR("Timeout waiting for the first Friend Update");
+        clear_friendship(true, false);
         break;
     case BLE_MESH_LPN_ESTABLISHED:
         if (lpn->req_attempts < REQ_ATTEMPTS(lpn)) {
@@ -1047,9 +1074,7 @@ int bt_mesh_lpn_init(void)
     k_delayed_work_init(&lpn->timer, lpn_timeout);
 
     if (lpn->state == BLE_MESH_LPN_ENABLED) {
-        if (IS_ENABLED(CONFIG_BLE_MESH_LPN_ESTABLISHMENT)) {
+        if (!IS_ENABLED(CONFIG_BLE_MESH_LPN_ESTABLISHMENT)) {
-            bt_mesh_scan_disable();
-        } else {
             bt_mesh_scan_enable();
         }