我的esp和android智能手机之间的连接有问题。
每当esp停止应答或发送串行端口上的任何内容时。在android上调试说“连接被拒绝”。然后，在2-3分钟后，它开始向串行端口发送垃圾邮件连接信息，可能10秒后工作正常。我也得到wifi evt:7-wifi\事件\软件模式\问题根据https://github.com/esp8266/arduino/issues/2735 “[ap]收到请求时出错”
... 每300毫秒更新一次数据。。。错误：19:48:58.765 wifi evt:7 19:49:00.627 wifi evt:7 19:49:00.627 wifi evt:7 19:49:12.179 wifi evt:7。。。然后很快的更新，大约50毫秒。
esp处于ap模式。
最新的图书馆。
esp代码：
# include <ESP8266WiFi.h>
//#include <Ticker.h>
//#include <Wire.h>
//#include "PCF8574.h"
//#include <ESP8266WiFiGratuitous.h>
const char* ssid = "wifitest2";
const char* password = "esp8266";
IPAddress ip(192,168,0,1);
IPAddress gateway(192,168,0,1);
IPAddress subnet(255,255,255,0);
WiFiServer server(80);
//Ticker timer;
const byte interruptPin = 13;
int czas2 = 0;
int czas = 0;
int a=1;
boolean auto_manual = 0;
unsigned long currentTime=0;
unsigned long previousTime=0;
const long Timeout=200;
//PCF8574 PCF_01(0x20);
void setup()
{
delay(10);
//pinMode(interruptPin, INPUT_PULLUP);
//attachInterrupt(digitalPinToInterrupt(interruptPin), handleInterrupt, FALLING);
Serial.begin(115200);
Serial.println();
//PCF_01.begin();
WiFi.softAPConfig(ip,gateway,subnet);
WiFi.mode(WIFI_AP);
WiFi.softAP(ssid, password,10,true,1);
IPAddress myIP = WiFi.softAPIP();
Serial.print("AP IP address: ");
Serial.println(myIP);
server.begin();
//experimental::ESP8266WiFiGratuitous::stationKeepAliveSetIntervalMs();
//timer.attach_ms(1,zegar);
}
// prepare a web page to be send to a client (web browser)
String prepareAnswer()
{
String htmlPage;
htmlPage.reserve(1024); // prevent ram fragmentation
htmlPage = F("HTTP/1.1 200 OK\r\n"
"Content-Type: text/html\r\n"
"Connection: close\r\n" // the connection will be closed after completion of the response
"\r\n"
"<!DOCTYPE HTML>"
"<html>");
htmlPage += F("@"
"300"
"#"
"200"
"$");
htmlPage += F("</html>"
"\r\n");
return htmlPage;
}
void loop()
{
WiFiClient client = server.available();
// wait for a client (web browser) to connect
if (client)
{
Serial.println("\n[Client connected]");
while (client.connected())
{
yield();
// read line by line what the client (web browser) is requesting
if (client.available())
{
String line = client.readStringUntil('\r');
Serial.print(line);
// wait for end of client's request, that is marked with an empty line
if (line.length() == 1 && line[0] == '\n')
{
client.println(prepareAnswer());
break;
}
}
}
while (client.available()) {
// but first, let client finish its request
// that's diplomatic compliance to protocols
// (and otherwise some clients may complain, like curl)
// (that is an example, prefer using a proper webserver library)
client.read();
yield();
}
// close the connection:
client.stop();
Serial.println("[Client disconnected]");
}
}android代码：
new HttpRequestAsyncTask(parameterValue, "192.168.0.1", "80", "").execute();
handler.postDelayed(this,300); //every XXX ms
}
};
public String sendRequest(String parameterValue, String ipAddress, String portNumber, String parameterName) {
String serverResponse = "ERROR";
try {
HttpClient httpclient = new DefaultHttpClient();
URI website = new URI("http://" + ipAddress + ":" + portNumber + "/" + parameterName + parameterValue);
HttpGet getRequest = new HttpGet();
getRequest.setURI(website);
HttpResponse response = httpclient.execute(getRequest);
InputStream content = null;
content = response.getEntity().getContent();
BufferedReader in = new BufferedReader(new InputStreamReader(content));
serverResponse = in.readLine();
content.close();
} catch (IOException | URISyntaxException e) {
serverResponse = e.getMessage();
e.printStackTrace();
}
return serverResponse;
}
1条答案
按热度按时间qvsjd97n1#
那张素描有几处地方不对劲。这个例子（你一定学过）在https://github.com/esp8266/arduino/blob/master/doc/esp8266wifi/server-examples.rst 你做对了。把它作为一个模板，开始做一些小的改变-一次一个。
你的
Serial.println("[Client disconnected]");在错误的地方。在房间里if (client.available())阻止但不应该阻止。你错过了
client.stop().您需要使用
if (line.length() == 1 && line[0] == '\n')或者类似的。串联响应（使用
s +=)导致堆碎片并生成无效的html代码。我唯一要补充的例子是
yield()两个人各打一个电话while-循环。它们有助于避免饥饿的系统进程。这个WiFiServer库可能已经在引擎盖下完成了，但是我们不能确定，除非我们检查代码。