NodeMCU信息
> Lua 5.1.4
> SDK 2.2.1
> Memory Usage :
> Total : 3260490 bytes
> Used : 9287 bytes
> Remain: 3251203 bytes
当我尝试发送带有大json字符串响应(json_response
)的HTTP响应时出现错误
PANIC: unprotected error in call to Lua API (file.lua:5: out of memory)
代码:
-- a simple HTTP server
srv = net.createServer(net.TCP)
srv:listen(80, function(conn)
conn:on("receive", function(sck, payload)
sck:send("HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n"..json_response)
end)
conn:on("sent", function(sck) sck:close() end)
end)
答案 0 :(得分:1)
是的,如果您尝试发送大量数据,那将不起作用。您需要逐份发送。 Our API documentation显示了两种方法(您可以在SO上找到更多参考文献),第一种是:
srv = net.createServer(net.TCP)
function receiver(sck, data)
local response = {}
-- if you're sending back HTML over HTTP you'll want something like this instead
-- local response = {"HTTP/1.0 200 OK\r\nServer: NodeMCU on ESP8266\r\nContent-Type: text/html\r\n\r\n"}
response[#response + 1] = "lots of data"
response[#response + 1] = "even more data"
response[#response + 1] = "e.g. content read from a file"
-- sends and removes the first element from the 'response' table
local function send(localSocket)
if #response > 0 then
localSocket:send(table.remove(response, 1))
else
localSocket:close()
response = nil
end
end
-- triggers the send() function again once the first chunk of data was sent
sck:on("sent", send)
send(sck)
end
srv:listen(80, function(conn)
conn:on("receive", receiver)
end)