diff --git a/libnymea-mqtt/mqtt.h b/libnymea-mqtt/mqtt.h
index 898e0a7..af1767b 100644
--- a/libnymea-mqtt/mqtt.h
+++ b/libnymea-mqtt/mqtt.h
@@ -34,6 +34,7 @@ namespace Mqtt {
 
 enum Protocol {
     ProtocolUnknown = 0x00,
+    Protocol310 = 0x03,
     Protocol311 = 0x04
 };
 
diff --git a/libnymea-mqtt/mqttserver.cpp b/libnymea-mqtt/mqttserver.cpp
index 854d96b..7c98728 100644
--- a/libnymea-mqtt/mqttserver.cpp
+++ b/libnymea-mqtt/mqttserver.cpp
@@ -280,8 +280,8 @@ void MqttServerPrivate::processPacket(const MqttPacket &packet, QTcpSocket *clie
 
         MqttPacket response(MqttPacket::TypeConnack, packet.packetId());
 
-        if (packet.protocolLevel() != Mqtt::Protocol311) {
-            qCWarning(dbgServer) << "This MQTT broker only supports Protocol version 3.1.1";
+        if (packet.protocolLevel() != Mqtt::Protocol310 && packet.protocolLevel() != Mqtt::Protocol311) {
+            qCWarning(dbgServer) << "This MQTT broker only supports Protocol version 3.1.0 and 3.1.1 but client is" << packet.protocolLevel();
             response.setConnectReturnCode(Mqtt::ConnectReturnCodeUnacceptableProtocolVersion);
             client->write(response.serialize());
             cleanupClient(client);