Add asyncronous client connect and MTU exchange.

* Adds parameters `asyncConnect` and `exchangeMTU` to `NimBLEClient::connect`, default values work as the original connect method. * * `asyncConnect`; if true, will send the connect command and return immediately with a true value for successfully sending the command, else false. * * `exchangeMTU`; if true will send the exchange MTU command upon connection, otherwise not and the application can choose to do this later via the `exchangeMTU` method. * Adds `onMTUChange` callback to `NimBLEClientCallbacks` * Add `NimBLEDevice::getConnectedClients()` which returns a vector of pointers to the currently connected client instances. * Calling `NimBLEClient::connect` will no longer cancel already in progress connections.
2024-11-10 13:02:11 -07:00
parent 724e1a7083
commit 38e764d157
10 changed files with 267 additions and 47 deletions
@@ -0,0 +1,83 @@
+
+/**
+ *  NimBLE_Async_client Demo:
+ *
+ *  Demonstrates asynchronous client operations.
+ *
+ *  Created: on November 4, 2024
+ *      Author: H2zero
+ *
+ */
+
+#include <NimBLEDevice.h>
+
+static constexpr uint32_t scanTimeMs = 5 * 1000;
+
+class ClientCallbacks : public NimBLEClientCallbacks {
+    void onConnect(NimBLEClient* pClient) {
+        printf("Connected to: %s\n", pClient->getPeerAddress().toString().c_str());
+    }
+
+    void onDisconnect(NimBLEClient* pClient, int reason) {
+        printf("%s Disconnected, reason = %d - Starting scan\n", pClient->getPeerAddress().toString().c_str(), reason);
+        NimBLEDevice::getScan()->start(scanTimeMs);
+    }
+} clientCB;
+
+class scanCallbacks : public NimBLEScanCallbacks {
+    void onResult(NimBLEAdvertisedDevice* advertisedDevice) {
+        printf("Advertised Device found: %s\n", advertisedDevice->toString().c_str());
+        if (advertisedDevice->haveName() && advertisedDevice->getName() == "NimBLE-Server") {
+            printf("Found Our Device\n");
+
+            auto pClient = NimBLEDevice::getDisconnectedClient();
+            if (!pClient) {
+                pClient = NimBLEDevice::createClient(advertisedDevice->getAddress());
+                if (!pClient) {
+                    printf("Failed to create client\n");
+                    return;
+                }
+            }
+
+            pClient->setClientCallbacks(&clientCB, false);
+            if (!pClient->connect(true, true, false)) { // delete attributes, async connect, no MTU exchange
+                NimBLEDevice::deleteClient(pClient);
+                printf("Failed to connect\n");
+                return;
+            }
+        }
+    }
+
+    void onScanEnd(NimBLEScanResults results) {
+        printf("Scan Ended\n");
+        NimBLEDevice::getScan()->start(scanTimeMs);
+    }
+};
+
+extern "C" void app_main(void) {
+    printf("Starting NimBLE Async Client\n");
+    NimBLEDevice::init("");
+    NimBLEDevice::setPower(3); /** +3db */
+
+    NimBLEScan* pScan = NimBLEDevice::getScan();
+    pScan->setScanCallbacks(new scanCallbacks());
+    pScan->setInterval(45);
+    pScan->setWindow(15);
+    pScan->setActiveScan(true);
+    pScan->start(scanTimeMs);
+
+    for (;;) {
+        vTaskDelay(pdMS_TO_TICKS(1000));
+        auto pClients = NimBLEDevice::getConnectedClients();
+        if (!pClients.size()) {
+            continue;
+        }
+
+        for (auto& pClient : pClients) {
+            printf("%s\n", pClient->toString().c_str());
+            NimBLEDevice::deleteClient(pClient);
+        }
+
+        NimBLEDevice::getScan()->start(scanTimeMs);
+    }
+}