Mqtt data way the data sent and received

I’m curious about how MQTT handles data transmission: does it transmit data as binary or as plaintext?

Additionally, I’d like to understand the rationale behind its classification as a lightweight protocol, especially in cases where the data is sent in plaintext.

How does transmitting data in plaintext align with MQTT’s goals of maintaining high efficiency and low resource consumption?

Hi @Nandhu

Absolutely, MQTT payload is binary indeed. For security, the connection between the client and broker must be encrypted using the TLS protocol. This ensures that the data transmitted remains confidential and secure, even though the payload itself is not encrypted.

I trust this addresses your inquiries. Should you have any further questions, please feel free to ask.

Warm regards,
Dasha from HiveMQ Team