【发布时间】：2021-04-09 05:00:43
【问题描述】：
我在 ESP 和 Android 智能手机之间的连接出现问题。
ESP 每隔 X 次停止在串行端口上响应或发送任何内容。在 Android 上调试时说“连接被拒绝”。然后，在 2-3 分钟后，它开始向串口发送垃圾邮件连接信息，并且可能在 10 秒后正常工作。 我也得到 wifi evt: 7 - WIFI_EVENT_SOFTAPMODE_PROBEREQRECVED 根据https://github.com/esp8266/Arduino/issues/2735 “[AP]收到请求时出错”
... 每 300 毫秒新数据 ... 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 ... 然后更新很快，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]");
}
}
安卓代码：
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;
}
【问题讨论】：
-
你的安卓设备是如何连接到ESP的串口的？
-
我的华为通过wifi连接到esp。我正在通过 arduino ide 在 pc 上读取串口
标签： java android arduino wifi esp8266