Thanks for sharing.
My two cents: As you are not using hardware interrupt for DIO0, you can replace your digitalRead() by a read of RFM95 register 0x12 (RegIrqFlags) bit 3 (TxDone).
This can free one pin on your ATTiny.
Thanks for sharing.
My two cents: As you are not using hardware interrupt for DIO0, you can replace your digitalRead() by a read of RFM95 register 0x12 (RegIrqFlags) bit 3 (TxDone).
This can free one pin on your ATTiny.