[RIIM] What application payload length is supported for uplink and downlink packet? Around 84 Bytes. Last Update: September 29, 2021 September 29, 2021 325 RIIM Q&A Related Knowledge Base Posts -[RIIM] Do you need a programmer to program the devices? I suppose the development boards can be programmed with the USB?[RIIM] Does RC1882CEF have inbuilt real time clock?[RIIM] Do I need an external pull-up resistor on the SPI CS (chip Select)?