wx.startLocalServiceDiscovery({
    // There is a service of type _http._tcp. in the local area network connected to the current mobile phone.
    serviceType: '_http._tcp.',
    success: console.log,
    fail: console.log
})

const listener = function (res) { console.log(res) }

wx.onLocalServiceResolveFail(listener)
wx.offLocalServiceResolveFail(listener) // The same function object as the listener must be passed in.

const listener = function (res) { console.log(res) }

wx.onLocalServiceLost(listener)
wx.offLocalServiceLost(listener) // The same function objct as used during listening must be passed in.

const listener = function (res) { console.log(res) }

wx.onLocalServiceFound(listener)
wx.offLocalServiceFound(listener) // The same function object as the one used during monitoring needs to be passed in.

const listener = function (res) { console.log(res) }

wx.onLocalServiceDiscoveryStop(listener)
wx.offLocalServiceDiscoveryStop(listener) // The same function object as the listener must be passed in.