[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 1525 SIGFOX Q&A Downlink , Sigfox , Transmit Related Knowledge Base Posts -[SIGFOX] Is the sensitivity a function of the chipset or is it something we can enhance with an LNA if necessary?[SIGFOX] What is the SIGFOX communication protocol?[SIGFOX] “We are using the RC1692 Sigfox modules. Is it possible for us to encrypt the payload from the device to the tower, and from the tower/server to the user. As there are only 8 bytes in the upload packets, we feel this will not provide enough entropy to do our own encryption.”