How to transmit a large amount of data using MQTT?

The MQTT protocol is not suitable for transferring large amounts of data because it is a lightweight publish/subscribe protocol designed for transmitting small messages.

If you need to transfer a large amount of data, you may consider the following methods:

1. Chunked transfer: breaking a large amount of data into multiple smaller chunks for transmission, where each chunk is sent as an independent message. The recipient can then reassemble these chunks in order to form the complete data.
2. Compress data: reduce the size of a large amount of data in order to lessen the burden of transmission.
3. Use alternative protocols: If the amount of data is very large, you can consider using other protocols like HTTP, TCP, which are more suitable for transmitting large amounts of data.
4. Transfer data using file transfer: Save large amounts of data as files, and then use other protocols for transmission. The recipient can read the data from the file as needed.

It is important to choose the appropriate method for transmitting large amounts of data based on the specific scenario and requirements.