How to send multiple data (conn:send()) with the new SDK (NodeMCU)

Question

I\'ve been reading the NodeMCU documentation and several closed issues about the change of SDK that previouly allowed to send multiple data streams (acting like a queued net

Answer 1

Here is my solution without using tables, saving some memory:

function Sendfile(sck, filename, sentCallback)
    if not file.open(filename, "r") then
        sck:close()
        return
    end
    local function sendChunk()
        local line = file.read(512)
        if line then 
            sck:send(line, sendChunk) 
        else
            file.close()
            collectgarbage()
            if sentCallback then
                sentCallback()
            else
                sck:close()
            end
        end
    end
    sendChunk()
end


srv = net.createServer(net.TCP)
srv:listen(80, function(conn)
    conn:on("receive", function(sck, req)
        sck:send("HTTP/1.1 200 OK\r\n" ..
            "Server: NodeMCU on ESP8266\r\n" ..
            "Content-Type: text/html; charset=UTF-8\r\n\r\n", 
            function()
                Sendfile(sck, "head.html", function() Sendfile(sck, "body.html") end)
            end)        
    end)
end)

And this is for serving single files:

function Sendfile(client, filename)
    if file.open(filename, "r") then
        local function sendChunk()
            local line = file.read(512)
            if line then 
                client:send(line, sendChunk) 
            else
                file.close()
                client:close()
                collectgarbage()
            end
        end
        client:send("HTTP/1.1 200 OK\r\n" ..
            "Server: NodeMCU on ESP8266\r\n" ..
            "Content-Type: text/html; charset=UTF-8\r\n\r\n", sendChunk)
    else
        client:send("HTTP/1.0 404 Not Found\r\n\r\nPage not found")
        client:close()
    end
end


srv = net.createServer(net.TCP)
srv:listen(80, function(conn)
    conn:on ("receive", function(client, request)
        local path = string.match(request, "GET /(.+) HTTP")
        if path == "" then path = "index.htm" end
        Sendfile(client, path)
    end)
end)