problem with multiple connections

bialabs commented 5 years ago

i am testing this library (1.0.1 and Espressif's AT firmware 1.7.1) with the following sketch:

#include "WiFiEspAT.h"

char ssid[] = "Wifi";            // your network SSID (name)
char pass[] = "pass";        // your network password
int status = WL_IDLE_STATUS;     // the Wifi radio's status

char server[] = "arduino.cc";

unsigned long lastConnectionTime = 0;         // last time you connected to the server, in milliseconds
const unsigned long postingInterval = 10000L; // delay between updates, in milliseconds

// Initialize the Ethernet client object
WiFiClient client;

void setup()
{
  // initialize serial for debugging
  Serial.begin(115200);
  // initialize serial for ESP module
  Serial3.begin(9600);
  // initialize ESP module
  WiFi.init(&Serial3);

  // check for the presence of the shield
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue
    while (true);
  }

  // attempt to connect to WiFi network
  while ( status != WL_CONNECTED) {
    Serial.print("Attempting to connect to WPA SSID: ");
    Serial.println(ssid);
    // Connect to WPA/WPA2 network
    status = WiFi.begin(ssid, pass);
  }

  Serial.println("You're connected to the network");

  printWifiStatus();
}

void loop()
{
  // if there's incoming data from the net connection send it out the serial port
  // this is for debugging purposes only
  while (client.available()) {
    char c = client.read();
    Serial.write(c);
  }

  // if 10 seconds have passed since your last connection,
  // then connect again and send data
  if (millis() - lastConnectionTime > postingInterval) {
    httpRequest();
  }
}

// this method makes a HTTP connection to the server
void httpRequest()
{
  Serial.println();

  // close any connection before send a new request
  // this will free the socket on the WiFi shield
  client.stop();

  // if there's a successful connection
  if (client.connect(server, 80)) {
    Serial.println("Connecting...");

    // send the HTTP PUT request
    client.println(F("GET /asciilogo.txt HTTP/1.1"));
    client.println(F("Host: arduino.cc"));
    client.println("Connection: close");
    client.println();

    // note the time that the connection was made
    lastConnectionTime = millis();
  }
  else {
    // if you couldn't make a connection
    Serial.println("Connection failed");
  }
}

void printWifiStatus()
{
  // print the SSID of the network you're attached to
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength
  long rssi = WiFi.RSSI();
  Serial.print("Signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

i have two problems

sometimes (3 times on 10) i get "Connection failed" debug output:


esp> AT+CIPSTART=4,"TCP","www.mysite.com",80 ...sent
esp> ?
esp> busy p... ...ignored

esp> ? esp> busy p... ...ignored

esp> DNS Fail ...ignored

esp> ERROR ...error esp ERROR: expected OK got ERROR Connection failed


- sometimes (1 times on 10) Serial.write(c) doesn't  write anything (connect works in this case because i get "Connecting...") 
debug output:

esp> AT+CIPSTART=4,"TCP","www.mysite.com",80 ...sent esp> 4,CONNECT ...ignored esp> OK ...matched Connecting... esp INFO: send data on link 4 esp> AT+CIPSEND=4,64 ...sent esp> OK ...ignored

esp> > ...matched esp> Recv 64 bytes ...matched esp> ? esp> busy s... ...ignored

esp> ? esp> busy s... ...ignored

esp> 4,CLOSED ...processed esp INFO: closed linkId 4 esp> SEND FAIL ...matched esp ERROR: failed to send data esp INFO: send data on link 4 esp ERROR: link is not connected.

esp INFO: close link 4 esp WARN: link is not active esp INFO: free linkId 4 esp INFO: start TCP to www.mysite.com:80 on link 4 esp> AT+CIPSTART=4,"TCP","www.mysite.com",80 ...sent esp> ? esp> busy p... ...ignored

esp> ? esp> busy p... ...ignored

esp> 4,CONNECT ...ignored esp> OK ...matched Connecting...



what i have tried
- connect to my hosting instead arduino.cc
- higher baudrate (115200, 250000)

but nothing changes

how can improve my sketch?
or is related to the library?

JAndrassy commented 5 years ago

according to this log, everything is OK with the library and the sketch. esp8266 has problems to connect to that site or to Internet. so it is a problem with the network.

or the esp8266 has restricted 'visibility' to AP and/or is underpowered so it has problems to transmit

or there is some RF interference

"busy p..." is "busy processing". this is a response of the AT firmware to the ? 'ping' from the library. the AT firmware responds so the library waits until next timeout.

the AT firmware responds with error messages. one is "SEND FAIL", one is "DNS Fail".

I run your sketch without problems.

bialabs commented 5 years ago

using an external antenna attached to the esp seems that works better! I think is a RF interference problem because my esp is near the router thank you for your advices

bialabs commented 5 years ago

in which conditions the library responds with: To much garbage on RX ?

after that error client.connect stops working. How to avoid that?

JAndrassy commented 5 years ago

in which conditions the library responds with: To much garbage on RX ?

after that error client.connect stops working. How to avoid that?

after 25 ignored lines waiting to match the expected response. usually there are ignored lines with some notifications from the AT firmware and at reset there are around 22 boot log lines. I implemented this to detect wrong connection for example with unconnected RX pin or without ground connected between Arduino and esp8266.

can you show the log?

bialabs commented 5 years ago

i'll explain better my case i am using your library in a project where i send the content of multiple files (many) from sd to server. Each file i make a client.connect and a get request. The strange part is that i have this error always after 255 client.connect. In the log i get:

(until this connection, all was working good with no problems)
esp> AT+CIPSTART=4,"TCP","www.myserver.com",80 ...sent

esp> ?
esp> busy p... ...ignored 
..(repeated 25 times)..

esp> ?
esp> busy p...esp ERROR: To much garbage on RX

for now i have found a dirty hack, when it happens i reinitialize the esp with:

Serial3.begin(9600);
WiFi.init(Serial3);
WiFi.begin(ssid, pass);

JAndrassy commented 5 years ago

it looks like a bug in AT firmware. if you want to try to wait longer, you can set longer timeout on Serial3 with Serial3.setTimeout(2000); (default is 1000 milliseconds)

bialabs commented 5 years ago

setTimeout do not fix the issue with the at firmware

for now when it happens i reinitialize Wifi. In this situation the esp seems disconnected, i get IP Address 0.0.0.0 and 0 dBm signal

JAndrassy / WiFiEspAT

problem with multiple connections #1