Max feed count per sketch

[OilSlick]

• Arduino board: Adafruit Feather HUZZAH with ESP8266

• Arduino IDE version (found in Arduino -> About Arduino menu): 1.8.13

• List the steps to reproduce the problem below (if possible attach a sketch or
  copy the sketch code in too):

Configure 20+ AdafruitIO_Feeds. I'm not sure if there is any correlation between the number of feeds configured for sub vs pub vs pub/sub.

The number of feeds that produces the exception seems relatively constant for me at 20+. However, the reason I found the issue was general, inconsistent lock-ups (that may be completely unrelated).

The sketch I am using to reproduce the error is below. The only information in config.h is my WiFi and AIO authentication information.

#include "config.h"                     // Needed for Adafruit IO
#include "AdafruitIO_WiFi.h"

#if defined(USE_AIRLIFT) || defined(ADAFRUIT_METRO_M4_AIRLIFT_LITE) ||         \
    defined(ADAFRUIT_PYPORTAL)
// Configure the pins used for the ESP32 connection
#if !defined(SPIWIFI_SS) // if the wifi definition isnt in the board variant
// Don't change the names of these #define's! they match the variant ones
#define SPIWIFI SPI
#define SPIWIFI_SS 10  // Chip select pin
#define SPIWIFI_ACK 9  // a.k.a BUSY or READY pin
#define ESP32_RESETN 6 // Reset pin
#define ESP32_GPIO0 -1 // Not connected
#endif
AdafruitIO_WiFi io(IO_USERNAME, IO_KEY, WIFI_SSID, WIFI_PASS, SPIWIFI_SS,
                   SPIWIFI_ACK, ESP32_RESETN, ESP32_GPIO0, &SPIWIFI);
#else
AdafruitIO_WiFi io(IO_USERNAME, IO_KEY, WIFI_SSID, WIFI_PASS);
#endif

//For Adafruit IO
AdafruitIO_Time *seconds = io.time(AIO_TIME_SECONDS);
AdafruitIO_Feed *nightmodeButtonFeed = io.feed("alarm.nightmode");
AdafruitIO_Feed *debugButtonFeed = io.feed("alarm.debug-button");

//AdafruitIO_Feed *currentTempFeed = io.feed("air-particulate-sensor.currenttemp");
//AdafruitIO_Feed *currentHumiFeed = io.feed("air-particulate-sensor.currenthumi");
//AdafruitIO_Feed *currentSmokeFeed = io.feed("air-particulate-sensor.currentsmoke");
//AdafruitIO_Feed *pm25CurrentFeed = io.feed("air-particulate-sensor.currentpm25");
AdafruitIO_Feed *pm10CurrentFeed = io.feed("air-particulate-sensor.currentpm10");
AdafruitIO_Feed *pm25AQIFeed = io.feed("air-particulate-sensor.aqipm25");

AdafruitIO_Feed *pm10AQIFeed = io.feed("air-particulate-sensor.aqipm10");

//AdafruitIO_Feed *light = io.feed("light");
//AdafruitIO_Feed *counter = io.feed("counter");
AdafruitIO_Feed *pm25nowCastFeed = io.feed("air-particulate-sensor.nowcastpm25");
AdafruitIO_Feed *pm10nowCastFeed = io.feed("air-particulate-sensor.nowcastpm10");

AdafruitIO_Feed *NH3Feed = io.feed("kencana-air-sensor.nh3");
AdafruitIO_Feed *COFeed = io.feed("kencana-air-sensor.co");
AdafruitIO_Feed *NO2Feed = io.feed("kencana-air-sensor.no2");
AdafruitIO_Feed *NO2ppbvFeed = io.feed("kencana-air-sensor.no2-ppbv");
AdafruitIO_Feed *NO2HourlyAvgFeed = io.feed("kencana-air-sensor.no2-hrly-avg");
AdafruitIO_Feed *NO2HourlyMinFeed = io.feed("kencana-air-sensor.no2-hrly-min");
AdafruitIO_Feed *NO2HourlyMaxFeed = io.feed("kencana-air-sensor.no2-hrly-max");

AdafruitIO_Feed *C3H8Feed = io.feed("kencana-air-sensor.c3h8");
AdafruitIO_Feed *C4H10Feed = io.feed("kencana-air-sensor.c4h10");
AdafruitIO_Feed *CH4Feed = io.feed("kencana-air-sensor.ch4");
AdafruitIO_Feed *H2Feed = io.feed("kencana-air-sensor.h2");
AdafruitIO_Feed *C2H5OHFeed = io.feed("kencana-air-sensor.c2h5oh");

void setup() 
{
  Serial.begin(115200);
  Serial.setDebugOutput(true);
  
  io.connect();
  
  //subscribe to AIO feeds from which we want input
  //iso->onMessage(handleISO);
  seconds->onMessage(handleSecs);
  nightmodeButtonFeed->onMessage(handlenightmodeButtonFeed);
  debugButtonFeed->onMessage(handledebugButtonFeed);

  while(io.status() < AIO_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
}

void loop() {
  io.run();
  // put your main code here, to run repeatedly:
}
void handlenightmodeButtonFeed(AdafruitIO_Data *data) 
{
}
void handledebugButtonFeed(AdafruitIO_Data *data) 
{
}
void handlepingButtonFeed(AdafruitIO_Data *data) 
{
}
void handleSecs(char *data, uint16_t len) 
{
  Serial.println(data);
}

The exception that I get from the ESP8266 is below:

Exception 28: LoadProhibited: A load referenced a page mapped with an attribute that does not permit loads
PC: 0x40220f96: br_ssl_hs_client_run at src/ssl/ssl_hs_client.c line 1871
EXCVADDR: 0x00000e94

Decoding stack results
0x402208e1: br_ssl_hs_client_run at src/ssl/ssl_hs_client.c line 1528
0x4021ef90: jump_handshake at src/ssl/ssl_engine.c line 1081
0x4021f475: br_ssl_engine_recvrec_ack at src/ssl/ssl_engine.c line 1206
0x40204ee2: BearSSL::WiFiClientSecure::_run_until(unsigned int, bool) at /Users/mwright/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.4/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 540
0x402023ec: Adafruit_MQTT_Client::connectServer() at /Users/mwright/Documents/Arduino/libraries/Adafruit_MQTT_Library/Adafruit_MQTT_Client.cpp line 34
0x40205091: BearSSL::WiFiClientSecure::available() at /Users/mwright/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.4/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 386
0x402044f2: BearSSL::WiFiClientSecure::connected() at /Users/mwright/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.4/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 260
0x40203120: ESP8266WiFiSTAClass::status() at /Users/mwright/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.4/libraries/ESP8266WiFi/src/ESP8266WiFiSTA.cpp line 634
0x40208e48: Adafruit_MQTT_Client::connected() at /Users/mwright/Documents/Arduino/libraries/Adafruit_MQTT_Library/Adafruit_MQTT_Client.cpp line 48
0x40201524: AdafruitIO::mqttStatus(bool) at /Users/mwright/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/AdafruitIO.cpp line 437
0x402015bf: AdafruitIO::status() at /Users/mwright/Documents/Arduino/libraries/Adafruit_IO_Arduino/src/AdafruitIO.cpp line 368
0x402010bd: setup() at /Users/mwright/Documents/Arduino/web_gateway/web_gateway.ino line 67
0x40207158: loop_wrapper() at /Users/mwright/Library/Arduino15/packages/esp8266/hardware/esp8266/2.7.4/cores/esp8266/core_esp8266_main.cpp line 194

Thank you in advance for your help!

[brentru]

@OilSlick I was able to reproduce this on my end. It seems like declaring < 20 feeds does not cause this issue. Also the ESP32 does not have this issue, if you have one.

This looks to be an issue within the ESP8266's board package's SSL module, BearSSL. It looks like an allocation failure occurs within BearSSL (similar to esp8266/Arduino#5815) when you allocate over 19 feeds on the ESP8266.

It also looks similar to this issue: esp8266/Arduino#7801 which I am now following.

[OilSlick]

Thank you for the update.