ndGroupSession.t</a> Ctypes_static.ptr</span> <span>&#45;&gt;</span> <span>Unsigned.uint8 Ctypes_static.ptr</span> <span>&#45;&gt;</span> Unsigned.size_t <span>&#45;&gt;</span> Unsigned.uint32 <span>&#45;&gt;</span> Unsigned.size_t</code></dt><dd><p><code>export_inbound_group_session sess key key_len msg_index</code></p><p>Export the base64-encoded ratchet key for this session, at the given index, in a format which can be used by olm_import_inbound_group_session</p><p>Returns the length of the ratchet key o