What do the 2 fields mqttSendBuffer and mqttRecvBuffer mean?

[Jacky Bek]

uint8_t is a unsigned __int8, meaning it is an integer.

What does integer pointer declare for mqttSendBuffer & mqttRecvBuffer used for?

There is already 2 other fields that captures the buffer size.

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/* mqtt network layer specific internal data */

typedef struct {

    UA_NetworkAddressUrlDataType address;

    UA_UInt32 mqttRecvBufferSize;

    UA_UInt32 mqttSendBufferSize;

    uint8_t *mqttSendBuffer;

    uint8_t *mqttRecvBuffer;

    UA_String *mqttClientId;

    UA_Connection *connection;

#ifdef UA_ENABLE_MQTT_TLS_OPENSSL

    SSL *ssl;

#endif

    void * mqttClient;

    void (*callback)(UA_ByteString *encodedBuffer, UA_ByteString *topic);

    UA_String mqttUsername;

    UA_String mqttPassword;

    UA_String mqttCaFilePath;

    UA_String mqttCaPath;

    UA_String mqttClientCertPath;

    UA_String mqttClientKeyPath;

    UA_Boolean mqttUseTLS;

} UA_PubSubChannelDataMQTT;