[SIGFOX] How many bytes can I transmit in one message from my device? You can send up to 12 bytes per message from the device (uplink). Last Update: August 8, 2017 December 5, 2016 1489 SIGFOX Q&A Related Knowledge Base Posts -[SIGFOX] Which Frequency unit must I order for the client in France ?[SIGFOX] Is my data secure and protected?[SIGFOX] How do I manage the unique ID and Key?