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Search timeouts are another aspect of searching that should be carefully considered in a multi-channel system. Long timeouts increase the likelihood of finding other devices, but at the cost of increasing the chance of channel collisions. This may have further consequences for other channels in the system (i.e. other channels dropping to search).
It is important to note that search can impact both master and slave channels. Channels using acknowledged messages are particularly susceptible, as acknowledged messages effectively use double the radio bandwidth of regular broadcast messages.
In general, shorter search timeouts are safer in a multi-channel use case, but the consequences of a search ending without acquisition (and channels closing) must also be considered.