[SIGFOX] How many bytes can I transmit in one message to my device? You can send up to 8 bytes per message to the device (downlink). Last Update: August 8, 2017 December 5, 2016 1607 SIGFOX Q&A Downlink , Sigfox , Transmit Related Knowledge Base Posts -[SIGFOX] What is the battery lifetime of a SIGFOX device?[SIGFOX] What is SIGFOX?[SIGFOX] Are the modules certified for FCC and Australia are exactly the same (hardware-wise) and if so, how they are switched to work under FCC or Australian standards