[RIIM] What application payload length is supported for uplink and downlink packet? Around 84 Bytes. Last Update: September 29, 2021 September 29, 2021 1236 RIIM Q&A Related Knowledge Base Posts -[RIIM] How many children can each node support?[RIIM] To what value is RIIM’s radio RF end matched to?[RIIM] How much flash memory does the application software have available for use?