why we use mqtt protocol?
610520
MQTT was built to be a low-overhead protocol that strongly considered bandwidth and CPU limitations. It was designed with the ability to run in an embedded environment where it would reliably and effectively provide an avenue for communication. MQTT fundamentally is a publish/subscribe protocol.
1134549
QUIC is Google's experimental, low-latency Internet transportation protocol over UDP, a protocol that is often used by gaming, streaming media and VoIP services. The name 'QUIC' stands for Quick UDP Internet Connection.
1426279
IoT encourages the communication between devices, also famously known as Machine-to-Machine (M2M) communication. Because of this, the physical devices are able to stay connected and hence the total transparency is available with lesser inefficiencies and greater quality.
330650
['Facilitating communication with legacy or non-internet connected devices.', 'Data caching, buffering and streaming.', 'Data pre-processing, cleansing, filtering and optimization.', 'Some data aggregation.', 'Device to Device communications/M2M.', 'Networking features and hosting live data.']
670135
That's where protocols such as the Transmission Control Protocol (TCP) come in. TCP is used in conjunction with IP in order to maintain a connection between the sender and the target and to ensure packet order. For example, when an email is sent over TCP, a connection is established and a 3-way handshake is made.
903786
MQTT is data centric whereas HTTP is document-centric. HTTP is request-response protocol for client-server computing and not always optimized for mobile devices. ... Besides, publish/subscribe model provides clients with independent existence from one another and enhance the reliability of the whole system.
263581
Sky Q: Using Ethernet instead of Wi-Fi Don't be scared by the little tab covering up the Ethernet port on the back of your Q Mini box. The system works just fine over Ethernet and, very recently, the system was updated to default to a wired connection if a live Ethernet cable is plugged in.
799629
It's because of peer to peer connection I believe :/ There's no other way to do it. Data packets are too small for servers, so if they used them everybody would be lagging a lot. ... It's a combination of dropped packets and ping.
1288827
You use BGP because you don't want to carry your entire internet routing table in your IGP (i.e. in my case, OSPF)... ... Countermeasures have now been implemented in IGP protocols (like this one for OSPF in IOS) to prevent redistribution from BGP into OSPF from causing a major outage.
123356
['multiplex traffic destined for different applications on the same host.', 'provide data transmission reliability within the Transport Layer by retransmitting lost packets (sending device) if necessary, and re-assembling received packets in the correct order (receiving device).']
830496
PPTP should almost never be used. It's easy to setup and fast, but it's incredibly insecure. L2TP/IPSec is a step up from PPTP, but it's also one of the slowest connections, and its security is questionable. ... IKEv2/IPSec is a pretty good choice for mobile users and a must-have for Blackberry users.
80359
Re: MQTT without internet There is no need to add a 3rd Pi - the mosquitto broker can run on either of your two Pi and both Pi can use it to send/receive messages to each other.
379541
Spanning Tree Protocol (STP) is a Layer 2 protocol that runs on bridges and switches. The specification for STP is IEEE 802.1D. The main purpose of STP is to ensure that you do not create loops when you have redundant paths in your network. Loops are deadly to a network.
750279
An Message Queue Interface (MQI) channel connects an IBM® MQ MQI client to a queue manager on a server machine, and is established when you issue an MQCONN or MQCONNX call from an IBM MQ MQI client application.
800002
It's not a linux specific thing, and ttys are not only used for virtual terminals. They're also used e.g. when you start an xterm once you're in a graphic interface. If there were fewer tty devices, you would not be able to have many xterms or ssh logins.
596194
['Process to process delivery – ... ', 'End-to-end Connection between hosts – ... ', 'Multiplexing and Demultiplexing – ... ', 'Congestion Control – ... ', 'Data integrity and Error correction – ... ', 'Flow control –']
728094
['It avoids interference from other wireless devices.', 'It has lower power consumption.', 'It is easily upgradeable.', 'It has range better than Infrared communication.', 'The Bluetooth is used for voice and data transfer.', 'Bluetooth devices are available at very cheap cost.', 'No line of sight hence can connect through any obstacles.']