15 minute delay doesn’t seem sufficient in a classical game. Spending 15 minutes on one crucial move is common and wouldn’t raise suspicion.
Give a little squeeze at the start of your turn, to indicate that you wish to request the next engine move, then sit there for 15 minutes appearing deep in thought until the answer is beamed to your behind.
Alternatively the device could stream all the moves with the move number encoded, so it could be entirely unidirectional and you wouldn’t need an input method. Just wait 15 minutes for the next move.
Give a little squeeze at the start of your turn, to indicate that you wish to request the next engine move, then sit there for 15 minutes appearing deep in thought until the answer is beamed to your behind.
Alternatively the device could stream all the moves with the move number encoded, so it could be entirely unidirectional and you wouldn’t need an input method. Just wait 15 minutes for the next move.