[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 1404 SIGFOX Q&A Downlink , Sigfox , Transmit Related Knowledge Base Posts -[SIGFOX] How do I manage the unique ID and Key?[SIGFOX] Are there any extra features on the module?[SIGFOX] Can you please provide the IDs and PACs asap?