pubsubclient/_posts/2000-06-05-setBufferSize.md

tag, type, name, params, returns

tag	type	name	params	returns
api	function	setBufferSize	name description type size the size, in bytes, for the internal buffer uint16_t	type values boolean value description false the buffer could not be resized value description true the buffer was resized

Sets the size, in bytes, of the internal send/receive buffer. This must be large enough to contain the full MQTT packet. When sending or receiving messages, the packet will contain the full topic string, the payload data and a small number of header bytes.

By default, it is set to 256 bytes - as defined by the MQTT_MAX_MESSAGE_SIZE constant in PubSubClient.h.

Note : setBufferSize returns a boolean flag to indicate whether it was able to reallocate the memory to change the buffer size. This means, unlike the other setXYZ functions that return a reference to the client, this function cannot be chained with those functions.