Max stack 4580, 4532, 4564, 4548 or something else.

Max stack 4596

#include<ESP8266WiFi.h>#include<WiFiClientSecure.h>#include<MQTT.h>#include<ArduinoJson.h>#include<time.h>#include<StackThunk.h>#defineemptyStringString()#include"secrets.h"constint MQTT_PORT =8883;constchar MQTT_SUB_TOPIC[] ="robo/cmds";constchar MQTT_PUB_TOPIC[] ="$aws/things/" THINGNAME"/shadow/update";#ifdef USE_SUMMER_TIME_DSTuint8_t DST =1;#elseuint8_t DST =0;#endifWiFiClientSecure net;BearSSL::X509Listcert(cacert);BearSSL::X509Listclient_crt(client_cert);BearSSL::PrivateKeykey(privkey);MQTTClient client;unsignedlong lastMillis =0;time_t now;time_t nowish =1510592825;voidNTPConnect(void){  Serial.print("Setting time using SNTP");configTime(TIME_ZONE *3600, DST *3600,"pool.ntp.org","time.nist.gov");  now =time(nullptr);while (now < nowish)  {delay(500);    Serial.print(".");    now =time(nullptr);  }  Serial.println("done!");structtm timeinfo;gmtime_r(&now, &timeinfo);  Serial.print("Current time:");  Serial.print(asctime(&timeinfo));}voidmessageReceived(String &topic, String &payload){  Serial.println("Received [" + topic +"]:" + payload);}voidlwMQTTErr(lwmqtt_err_t reason){if (reason ==lwmqtt_err_t::LWMQTT_SUCCESS)    Serial.print("Success");elseif (reason ==lwmqtt_err_t::LWMQTT_BUFFER_TOO_SHORT)    Serial.print("Buffer too short");elseif (reason ==lwmqtt_err_t::LWMQTT_VARNUM_OVERFLOW)    Serial.print("Varnum overflow");elseif (reason ==lwmqtt_err_t::LWMQTT_NETWORK_FAILED_CONNECT)    Serial.print("Network failed connect");elseif (reason ==lwmqtt_err_t::LWMQTT_NETWORK_TIMEOUT)    Serial.print("Network timeout");elseif (reason ==lwmqtt_err_t::LWMQTT_NETWORK_FAILED_READ)    Serial.print("Network failed read");elseif (reason ==lwmqtt_err_t::LWMQTT_NETWORK_FAILED_WRITE)    Serial.print("Network failed write");elseif (reason ==lwmqtt_err_t::LWMQTT_REMAINING_LENGTH_OVERFLOW)    Serial.print("Remaining length overflow");elseif (reason ==lwmqtt_err_t::LWMQTT_REMAINING_LENGTH_MISMATCH)    Serial.print("Remaining length mismatch");elseif (reason ==lwmqtt_err_t::LWMQTT_MISSING_OR_WRONG_PACKET)    Serial.print("Missing or wrong packet");elseif (reason ==lwmqtt_err_t::LWMQTT_CONNECTION_DENIED)    Serial.print("Connection denied");elseif (reason ==lwmqtt_err_t::LWMQTT_FAILED_SUBSCRIPTION)    Serial.print("Failed subscription");elseif (reason ==lwmqtt_err_t::LWMQTT_SUBACK_ARRAY_OVERFLOW)    Serial.print("Suback array overflow");elseif (reason ==lwmqtt_err_t::LWMQTT_PONG_TIMEOUT)    Serial.print("Pong timeout");}voidlwMQTTErrConnection(lwmqtt_return_code_t reason){if (reason ==lwmqtt_return_code_t::LWMQTT_CONNECTION_ACCEPTED)    Serial.print("Connection Accepted");elseif (reason ==lwmqtt_return_code_t::LWMQTT_UNACCEPTABLE_PROTOCOL)    Serial.print("Unacceptable Protocol");elseif (reason ==lwmqtt_return_code_t::LWMQTT_IDENTIFIER_REJECTED)    Serial.print("Identifier Rejected");elseif (reason ==lwmqtt_return_code_t::LWMQTT_SERVER_UNAVAILABLE)    Serial.print("Server Unavailable");elseif (reason ==lwmqtt_return_code_t::LWMQTT_BAD_USERNAME_OR_PASSWORD)    Serial.print("Bad UserName/Password");elseif (reason ==lwmqtt_return_code_t::LWMQTT_NOT_AUTHORIZED)    Serial.print("Not Authorized");elseif (reason ==lwmqtt_return_code_t::LWMQTT_UNKNOWN_RETURN_CODE)    Serial.print("Unknown Return Code");}voidconnectToMqtt(bool nonBlocking =false){  Serial.print("MQTT connecting");while (!client.connected())  {if (client.connect(THINGNAME))    {      Serial.println("connected!");if (!client.subscribe(MQTT_SUB_TOPIC))lwMQTTErr(client.lastError());    }else    {      Serial.print("SSL Error Code:");      Serial.println(net.getLastSSLError());      Serial.print("failed, reason ->");lwMQTTErrConnection(client.returnCode());if (!nonBlocking)      {        Serial.println(" < try again in 5 seconds");delay(5000);      }else      {        Serial.println(" <");      }    }    Serial.printf("Max stack %d.",stack_thunk_get_max_usage());if (nonBlocking)break;  }}voidconnectToWiFi(String init_str){if (init_str != emptyString)    Serial.print(init_str);while (WiFi.status() != WL_CONNECTED)  {    Serial.print(".");delay(1000);  }if (init_str != emptyString)    Serial.println("ok!");}voidcheckWiFiThenMQTT(void){connectToWiFi("Checking WiFi");connectToMqtt();}unsignedlong previousMillis =0;constlong interval =5000;voidcheckWiFiThenMQTTNonBlocking(void){connectToWiFi(emptyString);if (millis() - previousMillis >= interval && !client.connected()) {    previousMillis =millis();connectToMqtt(true);  }}voidcheckWiFiThenReboot(void){connectToWiFi("Checking WiFi");  Serial.print("Rebooting");  ESP.restart();}voidsendData(void){  DynamicJsonDocumentjsonBuffer(JSON_OBJECT_SIZE(3) +100);  JsonObject root = jsonBuffer.to<JsonObject>();  JsonObject state = root.createNestedObject("state");  JsonObject state_reported = state.createNestedObject("reported");  state_reported["value"] =random(100);  Serial.printf("Sending  [%s]:", MQTT_PUB_TOPIC);serializeJson(root, Serial);  Serial.println();char shadow[measureJson(root) +1];serializeJson(root, shadow,sizeof(shadow));if (!client.publish(MQTT_PUB_TOPIC, shadow,false,0))lwMQTTErr(client.lastError());}voidsetup(){  Serial.begin(115200);//gdbstub_init();delay(5000);  Serial.println();  Serial.println();  WiFi.hostname(THINGNAME);  WiFi.mode(WIFI_STA);  WiFi.begin(ssid, pass);connectToWiFi(String("Attempting to connect to SSID:") +String(ssid));NTPConnect();  net.setTrustAnchors(&cert);  net.setClientRSACert(&client_crt, &key);  client.begin(MQTT_HOST, MQTT_PORT, net);  client.onMessage(messageReceived);connectToMqtt();}voidloop(){//now = time(nullptr);if (!client.connected())  {    Serial.print("Not Connected");checkWiFiThenMQTT();//checkWiFiThenMQTTNonBlocking();//checkWiFiThenReboot();  }else  {    client.loop();if (millis() - lastMillis >5000)    {      lastMillis =millis();sendData();    }  }}

SDK:2.2.2-dev(38a443e)/Core:2.7.4=20704000/lwIP:STABLE-2_1_2_RELEASE/glue:1.2-30-g92add50/BearSSL:5c771bescandonestate: 0 -> 2 (b0)state: 2 -> 3 (0)state: 3 -> 0 (4)reconnectscandoneAttempting to connect to SSID: ARSnet...scandonestate: 0 -> 2 (b0).state: 2 -> 3 (0)state: 3 -> 5 (10)add 0aid 15cnt connected with ARSnet, channel 6dhcp client start...ip:192.168.2.122,mask:255.255.255.0,gw:192.168.2.1ok!Setting time using SNTP..................pm open,type:2 0...........done!Current time: Thu Dec 31 00:24:09 2020MQTT connecting BSSL:_connectSSL: start connectionBSSL:_run_until: TimeoutBSSL:_wait_for_handshake: failedBSSL:Couldn't connect. Error = 'Unknown error code.'SSL Error Code: 0failed, reason -> Connection Accepted < try again in 5 secondsMax stack 4580.Fatal exception 28(LoadProhibitedCause):epc1=0x4022451e, epc2=0x00000000, epc3=0x00000000, excvaddr=0x0000000c, depc=0x00000000

Exception 28: LoadProhibited: A load referenced a page mapped with an attribute that does not permit loadsPC: 0x4022309a: br_ssl_hs_client_run at src/ssl/ssl_hs_client.c line 1871EXCVADDR: 0x0000000cDecoding stack results0x402229e5: br_ssl_hs_client_run at src/ssl/ssl_hs_client.c line 15280x40221120: jump_handshake at src/ssl/ssl_engine.c line 10810x40221605: br_ssl_engine_recvrec_ack at src/ssl/ssl_engine.c line 12060x402060de: BearSSL::WiFiClientSecure::_run_until(unsigned int, bool) at /home/ccdocker/Arduino/hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 5400x40206f08: HardwareSerial::write(unsigned char const*, unsigned int) at /home/ccdocker/Arduino/hardware/esp8266com/esp8266/cores/esp8266/HardwareSerial.h line 1650x402072a1: Print::write(char const*) at /home/ccdocker/Arduino/hardware/esp8266com/esp8266/cores/esp8266/Print.h line 620x4020628d: BearSSL::WiFiClientSecure::available() at /home/ccdocker/Arduino/hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 3860x402053aa: BearSSL::WiFiClientSecure::connected() at /home/ccdocker/Arduino/hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp line 2600x40208b2d: __delay(unsigned long) at /home/ccdocker/Arduino/hardware/esp8266com/esp8266/cores/esp8266/core_esp8266_wiring.cpp line 570x4020a65d: MQTTClient::connected() at /home/ccdocker/Arduino/libraries/MQTT/src/MQTTClient.cpp line 3980x40202330: connectToMqtt(bool) at /home/ccdocker/projects/2020/robot_iot_3/robot_iot_3.ino line 1390x4020d7de: strdup at /home/earle/src/esp-quick-toolchain/repo/newlib/newlib/libc/string/strdup.c line 110x402024d1: setup() at /home/ccdocker/projects/2020/robot_iot_3/robot_iot_3.ino line 2590x402085dc: loop_wrapper() at /home/ccdocker/Arduino/hardware/esp8266com/esp8266/cores/esp8266/core_esp8266_main.cpp line 194