start mqtt client (based on paho.mqtt.c), basically works

3rd/paho.mqtt.c/src/MQTTReasonCodes.h

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+/*******************************************************************************
+ * Copyright (c) 2017, 2020 IBM Corp. and others
+ *
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v2.0
+ * and Eclipse Distribution License v1.0 which accompany this distribution.
+ *
+ * The Eclipse Public License is available at
+ *    https://www.eclipse.org/legal/epl-2.0/
+ * and the Eclipse Distribution License is available at
+ *   http://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * Contributors:
+ *    Ian Craggs - initial API and implementation and/or initial documentation
+ *******************************************************************************/
+
+#if !defined(MQTTREASONCODES_H)
+#define MQTTREASONCODES_H
+
+#include "MQTTExportDeclarations.h"
+
+/** The MQTT V5 one byte reason code */
+enum MQTTReasonCodes {
+  MQTTREASONCODE_SUCCESS = 0,
+  MQTTREASONCODE_NORMAL_DISCONNECTION = 0,
+  MQTTREASONCODE_GRANTED_QOS_0 = 0,
+  MQTTREASONCODE_GRANTED_QOS_1 = 1,
+  MQTTREASONCODE_GRANTED_QOS_2 = 2,
+  MQTTREASONCODE_DISCONNECT_WITH_WILL_MESSAGE = 4,
+  MQTTREASONCODE_NO_MATCHING_SUBSCRIBERS = 16,
+  MQTTREASONCODE_NO_SUBSCRIPTION_FOUND = 17,
+  MQTTREASONCODE_CONTINUE_AUTHENTICATION = 24,
+  MQTTREASONCODE_RE_AUTHENTICATE = 25,
+  MQTTREASONCODE_UNSPECIFIED_ERROR = 128,
+  MQTTREASONCODE_MALFORMED_PACKET = 129,
+  MQTTREASONCODE_PROTOCOL_ERROR = 130,
+  MQTTREASONCODE_IMPLEMENTATION_SPECIFIC_ERROR = 131,
+  MQTTREASONCODE_UNSUPPORTED_PROTOCOL_VERSION = 132,
+  MQTTREASONCODE_CLIENT_IDENTIFIER_NOT_VALID = 133,
+  MQTTREASONCODE_BAD_USER_NAME_OR_PASSWORD = 134,
+  MQTTREASONCODE_NOT_AUTHORIZED = 135,
+  MQTTREASONCODE_SERVER_UNAVAILABLE = 136,
+  MQTTREASONCODE_SERVER_BUSY = 137,
+  MQTTREASONCODE_BANNED = 138,
+  MQTTREASONCODE_SERVER_SHUTTING_DOWN = 139,
+  MQTTREASONCODE_BAD_AUTHENTICATION_METHOD = 140,
+  MQTTREASONCODE_KEEP_ALIVE_TIMEOUT = 141,
+  MQTTREASONCODE_SESSION_TAKEN_OVER = 142,
+  MQTTREASONCODE_TOPIC_FILTER_INVALID = 143,
+  MQTTREASONCODE_TOPIC_NAME_INVALID = 144,
+  MQTTREASONCODE_PACKET_IDENTIFIER_IN_USE = 145,
+  MQTTREASONCODE_PACKET_IDENTIFIER_NOT_FOUND = 146,
+  MQTTREASONCODE_RECEIVE_MAXIMUM_EXCEEDED = 147,
+  MQTTREASONCODE_TOPIC_ALIAS_INVALID = 148,
+  MQTTREASONCODE_PACKET_TOO_LARGE = 149,
+  MQTTREASONCODE_MESSAGE_RATE_TOO_HIGH = 150,
+  MQTTREASONCODE_QUOTA_EXCEEDED = 151,
+  MQTTREASONCODE_ADMINISTRATIVE_ACTION = 152,
+  MQTTREASONCODE_PAYLOAD_FORMAT_INVALID = 153,
+  MQTTREASONCODE_RETAIN_NOT_SUPPORTED = 154,
+  MQTTREASONCODE_QOS_NOT_SUPPORTED = 155,
+  MQTTREASONCODE_USE_ANOTHER_SERVER = 156,
+  MQTTREASONCODE_SERVER_MOVED = 157,
+  MQTTREASONCODE_SHARED_SUBSCRIPTIONS_NOT_SUPPORTED = 158,
+  MQTTREASONCODE_CONNECTION_RATE_EXCEEDED = 159,
+  MQTTREASONCODE_MAXIMUM_CONNECT_TIME = 160,
+  MQTTREASONCODE_SUBSCRIPTION_IDENTIFIERS_NOT_SUPPORTED = 161,
+  MQTTREASONCODE_WILDCARD_SUBSCRIPTIONS_NOT_SUPPORTED = 162
+};
+
+/**
+ * Returns a printable string description of an MQTT V5 reason code.
+ * @param value an MQTT V5 reason code.
+ * @return the printable string description of the input reason code.
+ * NULL if the code was not found.
+ */
+LIBMQTT_API const char* MQTTReasonCode_toString(enum MQTTReasonCodes value);
+
+#endif