I would like to design a system using Raspberry Pi that sends the sensor's data to server continuously and receive commands from server.
Will MQTT suit my needs ?
Is there any way to do so if I use Java on my Pi?
Edit
By continuously I mean that streams like video are continuous and other text based data is sent twice every minute.
The sensors are:
A 5MP camera (Webcam connected to USB of the Pi.)
LDR(Light and Dark) - Sensor
The server is based on a cloud hosting location.
Ok here goes
Look if it is already running on your Rpi linux flavor or install it
Look at which port MQTT is installed and open this port using port forwarding with your broadband modem
Connect your cloud server to your local MQTT
Test your sensors
I don't know how the temperature sensor will be connected, my best guess would be with an Arduino. If it is the case, you can connect it to MQTT with a shield. If not, please edit your question to tell us how your sensors will be connected to your system.
Raspberry Pi has a library called motion which allows to control the camera, its behaviour on detection,...
Unless motion has already a MQTT interface, your best move is to output movements as pictures and then use a homemade service which uses inotify to wait for a new file and act (MQTT /camera/motion yes)
If you need more advice, please edit your question with other elements.
By continuously I mean that streams like video are continuous
If you are considering continuous video streaming from Pi then LIVE555 Streaming Media is a may serve your purpose. Live555 will provide following:
