ios端没有任何问题，能建立 websocket 连接，安卓端就会反复中断，其他 http 接口是没有问题，就是无法建立 websocket 连接

export function initSocket() {
	let retryNum = 3
	let heartbeatTimer = null
	const role = 'customer'
	
	return new Promise((resovle, reject) => {
		getRoomID({
			role: role
		}).then((res) => {
			// res.data.roomID
			getApp().globalData.curRoomID = res.data.roomID
			const conn = wx.connectSocket({
				url: 'wss://' + res.data.targetHost + 'ws/' + res.data.roomID,
				header: {
					'content-type': 'application/json',
					role: role,
					token: getToken()
				},
				timeout: 5,
				success(res) {
					console.log('websocket connection is established!')
				},
				fail(err) {
					console.log(' wx.connectSocket err')
					console.log(err)
					if (retryNum > 0) {
						buryPointPackage(initSocket, 'ws://' + res.data.targetWebsocketUrl, err,
							0, {
								'content-type': 'application/json',
								role: role,
								token: getToken()
							})
						retryNum = retryNum - 1
						initSocket()
					} else {
						reject()
					}
				}
			})




			heartbeatTimer = setInterval(() => {
				conn.send({
					data: JSON.stringify({
						action: 'heartbeat',
						timestamp: Math.floor((Math.round(new Date()) / 1000))
					}),
				})
			}, 5000)


			conn.onOpen(() => {
				const roomID = res.data.roomID
				// 请求未读消息数量
				getUnreadMsgNum(roomID, conn)


				// 获取未读消息数量
				conn.onMessage((res) => {
					const data = JSON.parse(res.data)
					if (data.action === 'pullTheNumberOfUnreadMessagesAck') {
						setUnreadMsgNum(data.data.numberOfUnreadMessages)
						// 如果globalMenu已经初始化，就可以调用设置
						if (getApp().globalData.globalMenu) getApp().globalData
							.globalMenu.setUnreadMsgNum()
					} else if (data.action === 'noticeMessageToBePulled') {
						getUnreadMsgNum(roomID, conn)
					}
				})
				resovle({
					conn: conn,
					socketHost: res.data.targetHost
				})
			})
			
			conn.onClose(() => {
				console.log('conn.onClose')
				clearInterval(heartbeatTimer)
			})
			
			conn.onError((err) => {
				console.log(' onError err')
				console.log(err)
				clearInterval(heartbeatTimer)
			})
		})
	})
}