Added a test for instances count (memory leak again)

src/TinyMqtt.cpp

@@ -9,10 +9,14 @@ static auto red = TinyConsole::red;
 static auto yellow = TinyConsole::yellow;
 
 int TinyMqtt::debug=2;
+
 #endif
 
 #ifdef EPOXY_DUINO
   std::map<MqttMessage::Type, int> MqttClient::counters;
+  int MqttBroker::instances = 0;
+  int MqttClient::instances = 0;
+
 #endif
 
 MqttBroker::MqttBroker(uint16_t port, uint8_t max_retain_size)
@@ -23,10 +27,16 @@ MqttBroker::MqttBroker(uint16_t port, uint8_t max_retain_size)
 #ifdef TINY_MQTT_ASYNC
   server->onClient(onClient, this);
 #endif
+#ifdef EPOXY_DUINO
+  instances++;
+#endif
 }
 
 MqttBroker::~MqttBroker()
 {
+#ifdef EPOXY_DUINO
+  instances--;
+#endif
   while(clients.size())
   {
     auto client = clients[0];
@@ -56,6 +66,7 @@ MqttClient::MqttClient(MqttBroker* local_broker, TcpClient* new_client)
 #endif
 #ifdef EPOXY_DUINO
   alive = millis()+500000;
+  instances++;
 #else
   alive = millis()+5000;  // TODO MAGIC client expires after 5s if no CONNECT msg
 #endif
@@ -68,10 +79,16 @@ MqttClient::MqttClient(MqttBroker* local_broker, const string& id)
   keep_alive = 0;
 
   if (local_broker) local_broker->addClient(this);
+#ifdef EPOXY_DUINO
+  instances++;
+#endif
 }
 
 MqttClient::~MqttClient()
 {
+#ifdef EPOXY_DUINO
+  instances--;
+#endif
   close();
   delete tcp_client;
   debug("*** MqttClient delete()");

src/TinyMqtt.h

@@ -289,6 +289,7 @@ class MqttClient
 
 #ifdef EPOXY_DUINO
     static std::map<MqttMessage::Type, int> counters;  // Number of processed messages
+    static int instances;
 #endif
     uint32_t keepAlive() const { return keep_alive; }
 
@@ -354,6 +355,9 @@ class MqttBroker
     }
 
     const std::vector<MqttClient*>  getClients() const { return clients; }
+#ifdef EPOXY_DUINO
+    static int instances;
+#endif
 
   private:
     friend class MqttClient;

tests/network-tests/network-tests.ino

@@ -144,6 +144,40 @@ test(suback)
   assertEqual(MqttClient::counters[MqttMessage::Type::SubAck], 1);
 }
 
+test(broker_connect_and_client_deletion)
+{
+  assertEqual(MqttClient::instances, 0);
+  {
+    start_many_wifi_esp(2, true);
+    assertEqual(WiFi.status(), WL_CONNECTED);
+
+    MqttBroker broker(1883);
+    broker.begin();
+
+    ESP8266WiFiClass::selectInstance(2);
+    MqttBroker remote_broker(1883);
+    remote_broker.begin();
+    IPAddress remote_broker_ip = WiFi.localIP();
+    assertEqual(MqttClient::instances, 0);
+
+    ESP8266WiFiClass::selectInstance(1);
+    broker.connect(remote_broker_ip.toString().c_str());
+    remote_broker.loop();
+    assertEqual(remote_broker.clientsCount(), (size_t)1);
+
+    // Here, we have two MqttClient
+    // The client that connects broker to remote_broker
+    // The client created by remote_broker
+    assertEqual(MqttClient::instances, 2);
+
+    broker.connect("");
+    remote_broker.loop(); broker.loop();
+    remote_broker.loop(); broker.loop();
+    assertEqual(remote_broker.clientsCount(), (size_t)0);
+  }
+  assertEqual(MqttClient::instances, 0);
+}
+
 test(client_keep_alive_high)
 {
   const uint32_t keep_alive=1000;