Wait for the WebSocket connection to be open, before sending a message.

wait-for-open-websocket-connection.js

const waitForOpenConnection = (socket) => {
    return new Promise((resolve, reject) => {
        const maxNumberOfAttempts = 10
        const intervalTime = 200 //ms

        let currentAttempt = 0
        const interval = setInterval(() => {
            if (currentAttempt > maxNumberOfAttempts - 1) {
                clearInterval(interval)
                reject(new Error('Maximum number of attempts exceeded'))
            } else if (socket.readyState === socket.OPEN) {
                clearInterval(interval)
                resolve()
            }
            currentAttempt++
        }, intervalTime)
    })
}

const sendMessage = async (socket, msg) => {
    if (socket.readyState !== socket.OPEN) {
        try {
            await waitForOpenConnection(socket)
            socket.send(msg)
        } catch (err) { console.error(err) }
    } else {
        socket.send(msg)
    }
}

asdfsad

Merci