Exception(9) when receiving large payloads

[andreshidalgo08]

Hi, I'm new to the use of ESP and MQTT, I'm currently working on a NodeMCU v1.0. I would like to know what is the new limit length for the messages, I'm currently able to receive a 1011B payload using Mosquitto broker but I'm aiming for a 40MB payload, is this possible?

My code:

`#include <SPI.h>

include <ESP8266WiFi.h>

include <PubSubClient.h>

const char *ssid = "xxxxx";
const char *pass = "xxxxxxx";

IPAddress ip(192,168,200,60); // Blue 192,168,200,60 White 192,168,200,70
IPAddress subnet(255,255,255,0);
IPAddress gateway(192,168,200,1);

IPAddress server(192,168,200,80); //Broker MQTT

WiFiClient wclient;
PubSubClient client(wclient, server);

define BUFFER_SIZE 150000

void callback(const MQTT::Publish& pub) {
Serial.println("callback");
/*
Serial.print(pub.topic());
Serial.print(" => ");
if (pub.has_stream()) {
Serial.println("Aca2");
uint8_t buf[BUFFER_SIZE]; //Inicializa el buffer
int read; //Inicializa un int para
Serial.println(pub.payload_len());

while (read = pub.payload_stream()->read(buf, BUFFER_SIZE)) {
  Serial.write(buf, read);
}
pub.payload_stream()->stop();

} else {
//Serial.println(pub.payload_string());

//Serial.println(pub.payload_string()[0]);

Serial.println("Aca");

}
*/
}

void setup() {
// put your setup code here, to run once:
Serial.begin(115200);
Serial.println();
Serial.println();

pinMode(LED_BUILTIN, OUTPUT);

//Inicializacion para comunicacion SPI
pinMode(D1, INPUT); //output from display /TC_BUSY (if 0=busy if 1=ready to receive new commands)
pinMode(D2, OUTPUT); //TC_EN (1=disabled 0=enabled)

digitalWrite(D2, HIGH);
Serial.println("/TC_EN: ");
Serial.println(digitalRead(D2));

digitalWrite(D2, LOW); //to enable /TC_EN
Serial.println("/TC_EN: ");
Serial.println(digitalRead(D2));

SPI.begin();
pinMode(SS,OUTPUT);

digitalWrite(SS, HIGH);
Serial.println("/TC_CS: ");
Serial.println(digitalRead(SS));

delay(1);
}

void loop() {
// Para conectar al WiFi
if (WiFi.status() != WL_CONNECTED) {
Serial.print("Connecting to ");
Serial.print(ssid);
Serial.println(".");
WiFi.begin(ssid, pass);
WiFi.config(ip, gateway, subnet);

if (WiFi.waitForConnectResult() != WL_CONNECTED)
  return;
Serial.println("WiFi connected");  
Serial.println("IP address: ");
Serial.println(WiFi.localIP());

}

if (WiFi.status() == WL_CONNECTED) {
if (!client.connected()) {
if (client.connect("Blue")) { //Id del dispositivo
client.set_callback(callback); //callback, que va a hacer cuando reciba un mensaje
client.subscribe("demo/board2", 2); //topic al que esta subscrito, usar una variable
}
}

if (client.connected())
  client.loop();      //Wait for packets to come in, processing them.
  Serial.println("loop");

}

//Para verificar que esta funcionando
digitalWrite(LED_BUILTIN, LOW); //Enciende led
delay(200);
digitalWrite(LED_BUILTIN, HIGH); //Apaga led
delay(200);
}`

When I send a 1012B message I get this exception:

Exception (9):
epc1=0x40203dc4 epc2=0x00000000 epc3=0x00000000 excvaddr=0x00000005 depc=0x00000000

ctx: cont
sp: 3ffef590 end: 3ffef820 offset: 01a0

stack>>>
3ffef730: 3ffee7a4 0000019d 00000000 40203a1e
3ffef740: 00000000 00000000 00000000 4010068c
3ffef750: 00000000 00000001 3ffe88f5 3ffee7f0
3ffef760: 3fffdad0 00000001 3ffee650 40203c46
3ffef770: 40105244 00000001 3ffee650 40204020
3ffef780: 4021c21e 3ffee7e8 3ffee6d4 3fffdad0
3ffef790: 4021d073 3ffee7f0 402048d4 3ffee800
3ffef7a0: 3fff012c 402024d0 000000c8 40204da8
3ffef7b0: 3fffdad0 00000001 3ffee650 40201e81
3ffef7c0: 00000000 00000000 00000000 00000000
3ffef7d0: 40201be8 00000000 40204afc 40204ae8
3ffef7e0: 40201be8 00000000 3ffe88f0 01c8a8c0
3ffef7f0: 00000000 00000000 00000001 402048f5
3ffef800: 3fffdad0 00000000 3ffee7e8 40204920
3ffef810: feefeffe feefeffe 3ffee800 40100718
<<<stack<<<

Since I'm new to this I don't really know what to do to solve it.
Great work, thanks for the library!

[rampi]

Hi Andrés,
I had a similar problem, my solution was use other MQTT library, here the link: https://github.com/marvinroger/async-mqtt-client