Mqtt multiple clients with same id

1. How many clients can MQTT handle?
2. Can MQTT have multiple subscribers?
3. What is the maximum length of client ID in MQTT?
4. What is the limitation of MQTT?
5. Is MQTT hackable?
6. Can a MQTT client subscribe multiple topics?
7. Is MQTT full duplex?
8. Can a MQTT broker also be a client?
9. How many broker you can connect to is?
10. Can a client be both a publisher and a subscriber MQTT?
11. Does MQTT work over WiFi?
12. How many topics can MQTT handle?
13. How scalable is MQTT?
14. Is MQTT one to many?
15. Can a MQTT client subscribe multiple topics?
16. Is MQTT faster than HTTP?
17. Is MQTT full duplex?
18. Is MQTT good for real time?

How many clients can MQTT handle?

1,000 clients can easily be handled by any decent MQTT broker; there's a benchmark from Scalagent which shows that a PC with: a 3 GHz Intel Core 2 Duo processor.

Can MQTT have multiple subscribers?

A publisher sends messages on a specific topic to an MQTT broker, which forwards them to a client or clients that are subscribed to this topic. Each topic can only have one publisher but multiple subscribers.

What is the maximum length of client ID in MQTT?

The maximum length of the MQTT client identifier (ClientId) is increased to 256 from the 23-character limit that is imposed by V3. 1. The Platform Service service often requires longer client IDs. Long client IDs are supported regardless of the MQTT protocol version.

What is the limitation of MQTT?

Maximum message payload size

Some size limitations apply for the message payload on Platform Service. Important: The maximum payload size on Platform Service is 131072 bytes. Messages with a payload that is greater than the limit are rejected.

Is MQTT hackable?

Hron described five ways in which poorly configured MQTT servers can be abused by hackers: Open and unprotected MQTT servers can be found using the Shodan IoT search engine, and once connected, hackers can read messages transmitted using the MQTT protocol.

Can a MQTT client subscribe multiple topics?

Can MQTT subscribe to multiple topics? Yes. You can use MQTT wildcards to subscribe to multiple topics simultaneously. A wildcard can only be used to subscribe to topics, not to publish a message.

Is MQTT full duplex?

MQTT is standard publish/subscribe protocol which is used by embedded devices. It is also used as common M2M interactions. In this device connection is maintained and it uses full duplex TCP connection.

Can a MQTT broker also be a client?

Any device that has a TCP/IP stack and is capable of using an MQTT library can become an MQTT client, that is, a publisher, a subscriber or both a publisher and a subscriber. The MQTT library makes it possible for the device to talk MQTT on top of TCP/IP and to interact with specific types of MQTT servers.

How many broker you can connect to is?

One IS can connect to one and only one Broker.

Can a client be both a publisher and a subscriber MQTT?

Client. The client can be both a publisher and a subscriber of messages. It can publish a message to a broker, and it can subscribe to messages from the broker. ClientId is an identifier of each MQTT client that connects to an MQTT broker.

Does MQTT work over WiFi?

MQTT allows the complete line of NCD WiFi sensors to communicate via the internet to any MQTT Broker service using a WiFi connection. It only requires network connection credentials, connection information about the MQTT Host Broker, and authentication information for the MQTT connection if applicable.

How many topics can MQTT handle?

The length of the actual topic string is at most 65536 bytes. This is a limit imposed by the mqtt spec, you can't change it. It is also worth noting that the topic is encoded with utf-8, so you may have less than 65536 characters available. The payload of the message is limited to 268,435,456 bytes.

How scalable is MQTT?

Like security, MQTT broker scalability depends on the implementation. MQTT brokers can be scaled vertically or horizontally. For example, the Mosquitto broker provides horizontal scalability options. Horizontal scalability is hard to achieve as it requires manual configuration and in-depth knowledge of networks.

Is MQTT one to many?

The broker forwards the message to all subscribed clients. The publisher subscriber model allows MQTT clients to communicate one-to-one, one-to-many and many-to-one.

Can a MQTT client subscribe multiple topics?

Can MQTT subscribe to multiple topics? Yes. You can use MQTT wildcards to subscribe to multiple topics simultaneously. A wildcard can only be used to subscribe to topics, not to publish a message.

Is MQTT faster than HTTP?

According to measurements in 3G networks, throughput of MQTT is 93 times faster than HTTP's. Besides, in comparison to HTTP, MQTT Protocol ensures high delivery guarantees.

Is MQTT full duplex?

MQTT is standard publish/subscribe protocol which is used by embedded devices. It is also used as common M2M interactions. In this device connection is maintained and it uses full duplex TCP connection.

Is MQTT good for real time?

Overview. MQTT is a lightweight messaging protocol based on publish/subscribe model, specifically designed for IoT applications in low bandwidth and unstable network environments. It can provide real-time reliable messaging services for network-connected devices with minimal code.