The following L2CAP services are registered (dynamic channels): SDP, ATT (GATT), RFCOMM, HID (PSMs: 0x11, 0x13, 0x8001, 0x8003).
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The following HID transaction types are supported (by <code>hidh_l2cif_data_ind</code>): HANDSHAKE, CONTROL (only param VIRTUAL_CABLE_UNPLUG is supported), DATA, DATAC.
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* DATAC is not actually supported, since the callback function (<code>bta_hh_cback</code>) just frees the message and returns.