eir_append_service_data
u8 eir_append_service_data(u8 *eir, u16 eir_len, u16 uuid, u8 *data,
base_len = eir_append_service_data(eir, 0, 0x1851,
len = eir_append_service_data(ad, 0, 0x1852, bid, sizeof(bid));