[SIGFOX] How many bytes can I transmit in one message from my device? You can send up to 12 bytes per message from the device (uplink). Last Update: August 8, 2017 December 5, 2016 2183 SIGFOX Q&A Related Knowledge Base Posts -[SIGFOX] What does P1 and P2 certification means?[SIGFOX] Your spec sheet for RC1692HP-SIG has changed from VCC_PA to 3.6V maximum whene it was earlier 5V. What effect will this have?[SIGFOX] What does public ID and Key means?