Function libmosquitto_sys::mosquitto_subscribe_callback

pub unsafe extern "C" fn mosquitto_subscribe_callback(
    callback: Option<unsafe extern "C" fn(arg1: *mut mosquitto, arg2: *mut c_void, arg3: *const mosquitto_message) -> c_int>, 
    userdata: *mut c_void, 
    topic: *const c_char, 
    qos: c_int, 
    host: *const c_char, 
    port: c_int, 
    client_id: *const c_char, 
    keepalive: c_int, 
    clean_session: bool, 
    username: *const c_char, 
    password: *const c_char, 
    will: *const libmosquitto_will, 
    tls: *const libmosquitto_tls
) -> c_int