How i can resend same uplink frame on gateway failure or off ?

[rib.1]

Hi,

im using a loRawan module based on STM32WLE5 chip.

i would like to know how i can save an event to reTx it on the next uplink when i have my gateway off or during a blackout . im trying not to lose info .

my Tx duty cycle is every 90 minutes or on button click(event).

im using a Confirmed Data Up message type.

regards