I am currently building an IoT project witch will use an MQTT as the server. While there seems no good free server for me to test. Do you guys have any suggestions about the MQTT server for both free and non-free?
Please refer to following the example I am referring to. My server request is simple just like the example, data communication, and data storage.
Ameba Arduino: [RTL8195] [RTL8710] Use MQTT To Upload And Listen To Data
I use an old model B Raspberry Pi running 'Mosquitto' very successfully. To Pi also runs a webcam simultaneously and seems to cope without any problems.