In a few words
SIGFOX is an operated telecommunication network, dedicated to the Internet of Things.
It is an operated network, meaning you do not have to handle any installation or maintenance operations.
SIGFOX is seamless and out-of-the box, allowing you to forget about communication and keep focused on the core of your project.
It is a LPWA (Low-Power Wide-Area) network, currently deployed in Western Europe, San Francisco, and with ongoing tests in South America & Asia.
The SIGFOX allows a bidirectional communication, both from & to the device.
The communication is always initiated by the device.
The SIGFOX network is designed for small messages sent every now and then. It is not appropriate for high-bandwith usages (multimedia, permanent broadcast).
Its focus on energy efficiency allows you to build connected devices able to last years on a standard battery.
The SIGFOX network operates on sub-GHz frequencies, on ISM bands : 868MHz in Europe/ETSI & 902MHz in the US/FCC.
SIGFOX uses an Ultra-Narrow Band (UNB) modulation, which is key to our ability to provide a scalable & high-capacity network.
With a 162dB budget link SIGFOX enables long range communications, with much longer reach than GSM.
There is no negotiation between the device and a receiving station. The device simply emits in the available frequency band (+/- its own frequency shift).
The signal is detected by the closest base stations, decoded & forwarded to the network backend.
Deduplication & other protocol operations are handled by the network itself.
Messages are then forwarded to your own application, and made accessible using SIGFOX's API.
Each message is authenticated using a hash mechanism, and a private key specific to the device.
This offers a great protection against replay attacks.
The SIGFOX radio protocol also offers a great resistance to interferers.
In a few words
- Up to 12 bytes per message
- Up to 140 messages per day
You can send up to 12 bytes (96 bits) per message.
The protocol metadata already includes a timestamp & the device unique id.
Number of messages
The maximum number of messages that can be sent each day is 140.
This limitation is introduced, in part, to comply with regulations. The european regulation governing the 868MHz band enforces a transmission duty cycle of 1%.
A unique device is therefore not allowed to emit more than 1% of the time each hour and since emission of a message can take up to ~6 seconds, this allows up to 6 messages per hour.