[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 2049 SIGFOX Q&A Downlink , Sigfox , Transmit Related Knowledge Base Posts -[SIGFOX] What can Radiocrafts offer me?[SIGFOX] 2) How to ensure data reception (acknowledgment System)? How to ensure only issue until the corresponding address has received the data?[SIGFOX] Can you please provide the IDs and PACs asap?