What is the maximum payload size without encryption for the RFM69? With encryption it is limited to 61. What du I have to "pay" for encryption?
The RFM69 library I developed has a max packet sizee of 66bytes including the headers. You can use encryption or not, that doesn't affect this packet size. The RFM69 radios support other transmission modes (non packetized) and you can send a lot more data using those but you have to do all the work of figuring out when your data starts and ends etc. See the SX1231H datasheet for more: www.semtech.com/images/datasheet/sx1231h.pdf