ESP8266 Community Forum

Posted: **Wed Nov 23, 2022 11:07 pm**

ESP8266 throws a wdt reset every time it attempts to connect to a specific public transit API:

Code: Select allif (!client.connect("bustime.mta.info", 443))

  ets Jan  8 2013,rst cause:4, boot mode:(3,6)

  wdt reset
  load 0x4010f000, len 3460, room 16
  tail 4
  chksum 0xcc
  load 0x3fff20b8, len 40, room 4
  tail 4
  chksum 0xc9
  csum 0xc9
  v000719f0
  ~ld

I can connect with a browser: https://bustime.mta.info/api/siri/stop- ... .json?key=<MYKEY>&OperatorRef=MTA&MonitoringRef=MTA_401761&LineRef=MTA%20NYCT_M15%2B
Other ports (8080, 80) don't connect but don't trigger wdt either. Identical sketch connecting to a different API works fine. What am I missing?
Full code here, but never gets past connection attempt:

Code: Select all

//  get bus API key here: http://bt.mta.info/wiki/Developers/Index
//  info SIRI API http://bt.mta.info/wiki/Developers/SIRIIntro
// Working URL: https://bustime.mta.info/api/siri/stop-monitoring.json?key=<MYKEY>&OperatorRef=MTA&MonitoringRef=MTA_401761&LineRef=MTA%20NYCT_M15%2B

const int vers = 101;
#include <WiFiManager.h>
#include <ESP8266WiFi.h>
#include <WiFiClientSecure.h>
#include <ArduinoJson.h>

// ************* settings
const String busStopID = "401761"; const String busStop = "2 AVE/E 68 ST";
//const String busStopID = "903093"; constString busStop = "1 AVE/E 1 ST";
// busLine = "LineRef=MTA%20NYCT_M15%2B";   //M15-SBS for both stops
const String busMTAkey = <MY_KEY>;

// ************* declares
WiFiClientSecure client;    // For HTTPS requests

void setup() {
  Serial.begin(115200); yield();  delay(900);
  Serial.print("\n\nStarting MTA bus arrivals   vers "); Serial.println(vers);
  //****************** WiFi
  WiFiManager wifiManager;
  wifiManager.setTimeout(180);
  Serial.println(F("Connecting to WiFi"));
  if (!wifiManager.autoConnect("MTA bus arrivals")) {
    Serial.println(F("Failed to connect to WiFi, config as AP at 192.168.4.1"));
  }
  Serial.println(F("connected...yeey :)"));
} // end setup()

//****************** loop()
void loop() {
  getBusSchedule();
  for (int i = 0; i < 600; ++i) {
    yield();
    delay(100);
  }
}

//****************** get bus schedule https
void getBusSchedule() {
  Serial.println(F("Updating bus schedule"));
  client.setInsecure();         // needed for https
  yield();  delay(200);
  Serial.print(F("Connecting to bus host...  "));
  client.setTimeout(10000);    // 1000 or 10,000 still ng, wdt ,
  if (!client.connect("bustime.mta.info", 443)) {         // wdt reset port 443; 8080 and 80 fail
    Serial.println(F("Connection failed"));
    return;
  }
  Serial.println(F("Connected!\n"));
  // Send HTTP request. w id for a particular stop
  client.print(F("/api/siri/stop-monitoring.json?key="));
  client.print(busMTAkey);
  client.print(F("&OperatorRef=MTA&MonitoringRef="));
  client.print(busStopID);                            // bus stop, determines direction, etc
  client.println(F("&LineRef=MTA%20NYCT_M15%2B"));    // line M15-SBS
  client.println(F(" HTTP/1.0"));
  client.println(F("Host: bustime.mta.info"));
  client.println(F("Connection: close"));
  if (client.println() == 0) {
    Serial.println(F("Failed to send request"));
    client.stop();
    return;
  }
  char status[32] = {0};    // Check HTTP status
  client.readBytesUntil('\r', status, sizeof(status));
  if (strcmp(status, "HTTP/1.1 200 OK") != 0) {
    Serial.print(F("Unexpected response: "));
    Serial.println(status);
    client.stop();
    return;
  }
  char endOfHeaders[] = "\r\n\r\n";   // Skip HTTP headers
  if (!client.find(endOfHeaders)) {
    Serial.println(F("Invalid response"));
    client.stop();
    return;
  }
  //****************** JSON filter and deserialize
  // Stream& client;
  StaticJsonDocument<200> filter;
  filter["Siri"]["ServiceDelivery"]["StopMonitoringDelivery"][0]["MonitoredStopVisit"][0]["MonitoredVehicleJourney"]["MonitoredCall"]["ExpectedArrivalTime"] = true;
  StaticJsonDocument<2048> doc;
  DeserializationError error = deserializeJson(doc, client, DeserializationOption::Filter(filter), DeserializationOption::NestingLimit(12));
  if (error) {
    Serial.print(F("deserializeJson() failed: "));
    Serial.println(error.f_str());
    return;
  }
  for (JsonObject Siri_ServiceDelivery_StopMonitoringDelivery_0_MonitoredStopVisit_item : doc["Siri"]["ServiceDelivery"]["StopMonitoringDelivery"][0]["MonitoredStopVisit"].as<JsonArray>()) {
    const char* busArrivalTime = Siri_ServiceDelivery_StopMonitoringDelivery_0_MonitoredStopVisit_item["MonitoredVehicleJourney"]["MonitoredCall"]["ExpectedArrivalTime"];
    printf("%s M15-SBS at %s     ", busStop, busArrivalTime);
  }
}   //  end getBusSchedule()

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