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WhatsApp (officially WhatsApp Messenger) is an instant messaging (IM) and voice-over-IP (VoIP) service owned by technology conglomerate Meta. [14] It allows users to send text, voice messages and video messages, [15] make voice and video calls, and share images, documents, user locations, and other content.
ICQ was a cross-platform instant messaging (IM) and VoIP client. The name ICQ derives from the English phrase "I Seek You". [1] Originally developed by the Israeli company Mirabilis in 1996, the client was bought by AOL in 1998, and then by Mail.Ru Group (now VK) in 2010.
Skype for Business supports federated presence and IM to other popular instant message services such as AOL, Yahoo, MSN, and any service using the XMPP protocol, although support for XMPP has been deprecated in Skype for Business 2019. [18]
Messenger, [11] also known as Facebook Messenger, is an American proprietary instant messaging service developed by Meta Platforms.Originally developed as Facebook Chat in 2008, the client application of Messenger is currently available on iOS and Android mobile platforms, Windows and macOS desktop platforms, through the Messenger.com web application, and on the standalone Facebook Portal ...
Skype's co-founder Janus Friis helped create Wire and many Wire employees previously worked for Skype. [19] Wire Swiss GmbH launched the Wire app on 3 December 2014. In August 2015, the company added group calling to their app. [20] From its launch until March 2016, Wire's messages were only encrypted between the client and the company's server.
ChatSecure is a messaging application for iOS which allows OTR and OMEMO encryption for the XMPP protocol. ChatSecure is free and open source software available under the GPL-3.0-or-later license. ChatSecure has been used by international individuals [5] [6] and governments, [7] businesses, [8] and those spreading jihadi propaganda. [9] [10]
It consists of a message header and a message body separated by an empty line. DATA is actually a group of commands, and the server replies twice: once to the DATA command itself, to acknowledge that it is ready to receive the text, and the second time after the end-of-data sequence, to either accept or reject the entire message.
A retained message is a normal MQTT message with the retained flag set to true. The broker stores the last retained message and the corresponding quality of service (QoS) for the selected topic. Each client that subscribes to a topic pattern that matches the topic of the retained message receives the retained message immediately after they ...