copas looping issue while connecting the server

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Hi,
I am new to lua programming and trying to implement Lua-websocket in openwrt as a client.
Was trying to use client copas library but the issue is the script is getting stopped listening server after executing once (i.e. connecting to server, receiving message, sending message). I want the script to always listen the server without any timeout or script halt.
Below is the script

local copas = require'copas'
local websocket = require'websocket'
local json = require('json')
local client = require 'websocket.client'.new()

local ok,err = client:connect('ws://192.168.1.250:8080')
if not ok then
print('could not connect',err)
end

local ap_mac = { command = 'subscribe', channel = 'test' }
local ok = client:send(json.encode(ap_mac))
if ok then
print('msg sent')
else
print('connection closed')
end

local message,opcode = client:receive()
if message then
print('msg',message,opcode)
else
print('connection closed')
end

local replymessage = { command = 'message', message = 'TEST' }
local ok = client:send(json.encode(replymessage))
if ok then
print('msg sent')
else
print('connection closed')
end

copas.loop()

Here copas.loop() is not working.

On openWrt I had installed lua 5.1
Any help would be appreciated.

Start by reproducing the Lua 5.1 script on OpenWrt and inspect how client:receive interacts with copas.loop after the initial send and receive operations. The issue is resolved when the client continues listening and can exchange messages without stopping or timing out.

Written by the indexing model from the issue text.