L2HAC

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Introduction

The Low 2 High Auto Callback is an old protocol extension used by some eMule mods. Because of the new Mod Prot it is needed to be updated. The main idea is simple when a LowID source have a HighID client in his queue he will establish a connection for reask to the HighID on its own and the HighID will use it instead of triggering server/kad/xs based callbacks.

Specification

A mod announces the support for this feature in the common mod info tag (1 bit), if booth clients have set the bit than the HighID will not trigger any callbacks unless 59 minutes passed by since the last connection he had to the LowID, the LowID should automatically callback in 29 (normal) or 48 (nnp) minutes intervals, the exact callback interval can be chosen freely by the LowID from between 29 and 48 minutes.