• Ok, so yeah - if it disconnects something's gone wrong.

    Advertising doesn't have a timeout parameter? It has interval, which is the time between advertising packets being sent. Most devices only listen for 1 second by default, and it alternates advertising over 3 different frequencies - so if you have a particularly dumb central then it'll only listen on one frequency for 1 second - hence you need <300ms interval to be connectable reliably.

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