Signal

信号的无线直接的聊天应用程序，它的工作原理没有互联网。

Signal is a Wifi Direct based offline messaging app. Signal allows you to communicate without internet or local network in range of upto 100 meters. Messaging could be one-on-one or in a group. Messages sent via signal app are delivered in secure way. In short signal allows you to send audio,text,photo and video messages to users around you over wifi direct.

Chat with your friends and colleagues without wasting your data plan. One can use signal messenger in any instance where internet is not accessible, such as Cruise ship, wild life safari, foreign trip with family or when you run out of your data pack.

Large files can be shared easily with signal. Since signal uses Wifi Direct data transfers at the rate of 250mbps. Large files such as video,wall papers can be shared at the fastest rate using widi technology. Due to the incredible transfer rate all image & video files are transferred without any modification.

Signal is complete off the grid messaging app. It is free, registration is offline and no information flows via any sort of cloud.

Features

Instantly send messages, audio and photos to anyone around you over wifi direct

Send messages one-on-one or to entire group.

Works without any form of internet or local network all it needs is another signal.

Share files such as images & video as is. [As taken by camera and no re sizing or re scaling is applied]

Old chats are stored in database and are accessible anytime.

Full material design support. Signal comes in different colors.

Signal is walkie talkie that works without internet.

Communication via signal is secure.

[How it works]

Signal app is based on Wi-Fi peer-to-peer technology which enables the android devices (Android 4.0 and above) to connect directly to each other via WiFi without any intermediate access point. Wi-Fi peer-to-peer technology is also known as Wi-Fi Direct.

Signal app on start-up sends a signal to discover nearby devices. User can send additional signals by swiping the available list. Once the devices are found they appear in the available user list. Grey color signifies no connection while colored blocked is the indicator for connected device. Once the devices are found signal app establish the connections between the devices.