Remove task notification for server indications.

This resolves an issue when sending an indication from a callback that can cause the server to hang.

src/NimBLECharacteristic.cpp

@@ -52,7 +52,6 @@ NimBLECharacteristic::NimBLECharacteristic(const NimBLEUUID &uuid, uint16_t prop
     m_pService   = pService;
     m_value      = "";
     m_valMux     = portMUX_INITIALIZER_UNLOCKED;
-    m_pTaskData  = nullptr;
     m_timestamp  = 0;
 } // NimBLECharacteristic
 
@@ -301,14 +300,12 @@ void NimBLECharacteristic::setSubscribe(struct ble_gap_event *event) {
         subVal |= NIMBLE_SUB_INDICATE;
     }
 
-    if(m_pTaskData != nullptr) {
-        m_pTaskData->rc = (subVal & NIMBLE_SUB_INDICATE) ? 0 :
-                          NimBLECharacteristicCallbacks::Status::ERROR_INDICATE_DISABLED;
-        xTaskNotifyGive(m_pTaskData->task);
-    }
-    
     NIMBLE_LOGI(LOG_TAG, "New subscribe value for conn: %d val: %d",
-                         event->subscribe.conn_handle, subVal);
+                          event->subscribe.conn_handle, subVal);
+
+    if(!event->subscribe.cur_indicate && event->subscribe.prev_indicate) {
+       NimBLEDevice::getServer()->clearIndicateWait(event->subscribe.conn_handle);
+    }
 
     m_pCallbacks->onSubscribe(this, &desc, subVal);
 
@@ -329,9 +326,7 @@ void NimBLECharacteristic::setSubscribe(struct ble_gap_event *event) {
 
     } else if(it != m_subscribedVec.end()) {
         m_subscribedVec.erase(it);
-        m_subscribedVec.shrink_to_fit();
     }
-    
 }
 
 
@@ -416,40 +411,20 @@ void NimBLECharacteristic::notify(bool is_notification) {
         // We also must create it in each loop iteration because it is consumed with each host call.
         os_mbuf *om = ble_hs_mbuf_from_flat((uint8_t*)value.data(), length);
 
-        NimBLECharacteristicCallbacks::Status statusRC;
-
         if(!is_notification && (m_properties & NIMBLE_PROPERTY::INDICATE)) {
-            ble_task_data_t taskData = {nullptr, xTaskGetCurrentTaskHandle(),0, nullptr};
-            m_pTaskData = &taskData;
+            if(!NimBLEDevice::getServer()->setIndicateWait(it.first)) {
+               NIMBLE_LOGE(LOG_TAG, "prior Indication in progress");
+               os_mbuf_free_chain(om);
+               return;
+            }
 
             rc = ble_gattc_indicate_custom(it.first, m_handle, om);
             if(rc != 0){
-                statusRC = NimBLECharacteristicCallbacks::Status::ERROR_GATT;
-            } else {
-                ulTaskNotifyTake(pdTRUE, portMAX_DELAY);
-                rc = m_pTaskData->rc;
-            }
-
-            m_pTaskData = nullptr;
-
-            if(rc == BLE_HS_EDONE) {
-                rc = 0;
-                statusRC = NimBLECharacteristicCallbacks::Status::SUCCESS_INDICATE;
-            } else if(rc == BLE_HS_ETIMEOUT) {
-                statusRC = NimBLECharacteristicCallbacks::Status::ERROR_INDICATE_TIMEOUT;
-            } else {
-                statusRC = NimBLECharacteristicCallbacks::Status::ERROR_INDICATE_FAILURE;
+                NimBLEDevice::getServer()->clearIndicateWait(it.first);
             }
         } else {
-            rc = ble_gattc_notify_custom(it.first, m_handle, om);
-            if(rc == 0) {
-                statusRC = NimBLECharacteristicCallbacks::Status::SUCCESS_NOTIFY;
-            } else {
-                statusRC = NimBLECharacteristicCallbacks::Status::ERROR_GATT;
-            }
+            ble_gattc_notify_custom(it.first, m_handle, om);
         }
-
-        m_pCallbacks->onStatus(this, statusRC, rc);
     }
 
     NIMBLE_LOGD(LOG_TAG, "<< notify");

src/NimBLECharacteristic.h

@@ -150,7 +150,6 @@ private:
     NimBLEService*                 m_pService;
     std::string                    m_value;
     std::vector<NimBLEDescriptor*> m_dscVec;
-    ble_task_data_t                *m_pTaskData;
     portMUX_TYPE                   m_valMux;
     time_t                         m_timestamp;
 

src/NimBLEServer.cpp

@@ -37,6 +37,7 @@ static NimBLEServerCallbacks defaultCallbacks;
  * the NimBLEDevice class.
  */
 NimBLEServer::NimBLEServer() {
+    memset(m_indWait, BLE_HS_CONN_HANDLE_NONE, sizeof(m_indWait));
 //    m_svcChgChrHdl          = 0xffff; // Future Use
     m_pServerCallbacks      = &defaultCallbacks;
     m_gattsStarted          = false;
@@ -419,18 +420,44 @@ NimBLEConnInfo NimBLEServer::getPeerIDInfo(uint16_t id) {
         } // BLE_GAP_EVENT_MTU
 
         case BLE_GAP_EVENT_NOTIFY_TX: {
-            if(event->notify_tx.indication && event->notify_tx.status != 0) {
-                for(auto &it : server->m_notifyChrVec) {
-                    if(it->getHandle() == event->notify_tx.attr_handle) {
-                        if(it->m_pTaskData != nullptr) {
-                            it->m_pTaskData->rc = event->notify_tx.status;
-                            xTaskNotifyGive(it->m_pTaskData->task);
-                        }
-                        break;
-                    }
+            NimBLECharacteristic *pChar = nullptr;
+
+            for(auto &it : server->m_notifyChrVec) {
+                if(it->getHandle() == event->notify_tx.attr_handle) {
+                    pChar = it;
                 }
             }
 
+            if(pChar == nullptr) {
+                return 0;
+            }
+
+            NimBLECharacteristicCallbacks::Status statusRC;
+
+            if(event->notify_tx.indication) {
+                if(event->notify_tx.status != 0) {
+                    if(event->notify_tx.status == BLE_HS_EDONE) {
+                        statusRC = NimBLECharacteristicCallbacks::Status::SUCCESS_INDICATE;
+                    } else if(rc == BLE_HS_ETIMEOUT) {
+                        statusRC = NimBLECharacteristicCallbacks::Status::ERROR_INDICATE_TIMEOUT;
+                    } else {
+                        statusRC = NimBLECharacteristicCallbacks::Status::ERROR_INDICATE_FAILURE;
+                    }
+                } else {
+                    return 0;
+                }
+
+                server->clearIndicateWait(event->notify_tx.conn_handle);
+            } else {
+                if(event->notify_tx.status == 0) {
+                    statusRC = NimBLECharacteristicCallbacks::Status::SUCCESS_NOTIFY;
+                } else {
+                    statusRC = NimBLECharacteristicCallbacks::Status::ERROR_GATT;
+                }
+            }
+
+            pChar->m_pCallbacks->onStatus(pChar, statusRC, event->notify_tx.status);
+
             return 0;
         } // BLE_GAP_EVENT_NOTIFY_TX
 
@@ -732,6 +759,27 @@ void NimBLEServer::updateConnParams(uint16_t conn_handle,
 }// updateConnParams
 
 
+bool NimBLEServer::setIndicateWait(uint16_t conn_handle) {
+    for(auto i = 0; i < CONFIG_BT_NIMBLE_MAX_CONNECTIONS; i++) {
+        if(m_indWait[i] == conn_handle) {
+            return false;
+        }
+    }
+
+    return true;
+}
+
+
+void NimBLEServer::clearIndicateWait(uint16_t conn_handle) {
+    for(auto i = 0; i < CONFIG_BT_NIMBLE_MAX_CONNECTIONS; i++) {
+        if(m_indWait[i] == conn_handle) {
+            m_indWait[i] = BLE_HS_CONN_HANDLE_NONE;
+            return;
+        }
+    }
+}
+
+
 /** Default callback handlers */
 
 void NimBLEServerCallbacks::onConnect(NimBLEServer* pServer) {

src/NimBLEServer.h

@@ -77,6 +77,7 @@ private:
     bool                   m_svcChanged;
     NimBLEServerCallbacks* m_pServerCallbacks;
     bool                   m_deleteCallbacks;
+    uint16_t               m_indWait[CONFIG_BT_NIMBLE_MAX_CONNECTIONS];
     std::vector<uint16_t>  m_connectedPeersVec;
 
 //    uint16_t               m_svcChgChrHdl; // Future use
@@ -86,6 +87,8 @@ private:
 
     static int             handleGapEvent(struct ble_gap_event *event, void *arg);
     void                   resetGATT();
+    bool                   setIndicateWait(uint16_t conn_handle);
+    void                   clearIndicateWait(uint16_t conn_handle);
 }; // NimBLEServer