[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 1610 SIGFOX Q&A Downlink , Sigfox , Transmit Related Knowledge Base Posts -[SIGFOX] What is the competitive advantage of Radiocrafts vs other module providers?[SIGFOX] What is the advantage of using the Radiocrafts RC16xxxx-SIG module?[SIGFOX] How good is the coverage, and where can I find a coverage map?