Stuck with Exception 28
Posted: Thu Jun 17, 2021 6:50 pmhello, i am a newb to arduino ide and these codes, trying to use my nodemcu esp-12e as a coap client but i keep getting an exception 28 error which i dont know what is causing, this is a school project and i cant seem to make any progress, it would be appreciated if i could get any help, thanks in advance.
Exception 28: LoadProhibited: A load referenced a page mapped with an attribute that does not permit loads
PC: 0x4000bf80
EXCVADDR: 0x0000008c
Decoding stack results
0x402019e0: coapClient::send(IPAddress, int, char*, COAP_TYPE, COAP_METHOD, unsigned char*, unsigned char, unsigned char*, unsigned int, unsigned char, unsigned char) at C:\Users\ugur_\OneDrive\Belgeler\Arduino\libraries\ESP-CoAP-master\coap_client.cpp line 81
0x40100100: ets_intr_lock() at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\core_esp8266_main.cpp line 159
0x402035e6: uart_tx_fifo_available(int) at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\uart.cpp line 499
0x40203670: uart_do_write_char(int, char) at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\uart.cpp line 512
0x40201ea8: HardwareSerial::write(unsigned char) at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266/HardwareSerial.h line 189
0x40201a70: coapClient::loop() at C:\Users\ugur_\OneDrive\Belgeler\Arduino\libraries\ESP-CoAP-master\coap_client.cpp line 191
0x4020825b: rand at /workdir/repo/newlib/newlib/libc/stdlib/rand.c line 79
0x40201a3c: coapClient::get(IPAddress, int, char*) at C:\Users\ugur_\OneDrive\Belgeler\Arduino\libraries\ESP-CoAP-master\coap_client.cpp line 29
0x401008cc: malloc(size_t) at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\umm_malloc\umm_malloc.cpp line 821
0x40100274: pvPortMalloc(size_t, char const*, int) at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\umm_malloc/umm_heap_select.h line 85
0x40201a70: coapClient::loop() at C:\Users\ugur_\OneDrive\Belgeler\Arduino\libraries\ESP-CoAP-master\coap_client.cpp line 191
0x402021f8: Print::println() at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266/Print.h line 57
0x402017c7: coapClient::start() at C:\Users\ugur_\OneDrive\Belgeler\Arduino\libraries\ESP-CoAP-master\coap_client.cpp line 24
0x4020118a: setup() at C:\Users\ugur_\AppData\Local\Temp\arduino_modified_sketch_968430/coapclient.ino line 66
0x40202934: loop_wrapper() at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\core_esp8266_main.cpp line 198
I'm using NodeMCU ESP-12E on Windows and Arduino IDE 1.8.15
https://github.com/automote/ESP-CoAP - This is the library i used
I'm sorry if this is the wrong section, please remove if so.
Exception 28: LoadProhibited: A load referenced a page mapped with an attribute that does not permit loads
PC: 0x4000bf80
EXCVADDR: 0x0000008c
Decoding stack results
0x402019e0: coapClient::send(IPAddress, int, char*, COAP_TYPE, COAP_METHOD, unsigned char*, unsigned char, unsigned char*, unsigned int, unsigned char, unsigned char) at C:\Users\ugur_\OneDrive\Belgeler\Arduino\libraries\ESP-CoAP-master\coap_client.cpp line 81
0x40100100: ets_intr_lock() at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\core_esp8266_main.cpp line 159
0x402035e6: uart_tx_fifo_available(int) at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\uart.cpp line 499
0x40203670: uart_do_write_char(int, char) at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\uart.cpp line 512
0x40201ea8: HardwareSerial::write(unsigned char) at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266/HardwareSerial.h line 189
0x40201a70: coapClient::loop() at C:\Users\ugur_\OneDrive\Belgeler\Arduino\libraries\ESP-CoAP-master\coap_client.cpp line 191
0x4020825b: rand at /workdir/repo/newlib/newlib/libc/stdlib/rand.c line 79
0x40201a3c: coapClient::get(IPAddress, int, char*) at C:\Users\ugur_\OneDrive\Belgeler\Arduino\libraries\ESP-CoAP-master\coap_client.cpp line 29
0x401008cc: malloc(size_t) at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\umm_malloc\umm_malloc.cpp line 821
0x40100274: pvPortMalloc(size_t, char const*, int) at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\umm_malloc/umm_heap_select.h line 85
0x40201a70: coapClient::loop() at C:\Users\ugur_\OneDrive\Belgeler\Arduino\libraries\ESP-CoAP-master\coap_client.cpp line 191
0x402021f8: Print::println() at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266/Print.h line 57
0x402017c7: coapClient::start() at C:\Users\ugur_\OneDrive\Belgeler\Arduino\libraries\ESP-CoAP-master\coap_client.cpp line 24
0x4020118a: setup() at C:\Users\ugur_\AppData\Local\Temp\arduino_modified_sketch_968430/coapclient.ino line 66
0x40202934: loop_wrapper() at C:\Users\ugur_\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.0.0\cores\esp8266\core_esp8266_main.cpp line 198
Code: Select all
/*
ESP-COAP Client
*/
#include <ESP8266WiFi.h>
#include "coap_client.h"
//instance for coapclient
coapClient coap;
//WiFi connection info
const char* ssid = "tt12";
const char* password = "12345";
//ip address and default port of coap server in which your interested in
IPAddress ip(127,0,0,1);//take ETH Zurich or coap.me server to run and check client
int port =5683;
// coap client response callback
void callback_response(coapPacket &packet, IPAddress ip, int port);
// coap client response callback
void callback_response(coapPacket &packet, IPAddress ip, int port) {
char p[packet.payloadlen + 1];
memcpy(p, packet.payload, packet.payloadlen);
p[packet.payloadlen] = NULL;
//response from coap server
if(packet.type==3 && packet.code==0){
Serial.println("ping ok");
}
Serial.println(p);
}
void setup() {
Serial.begin(115200);
WiFi.begin(ssid, password);
Serial.println(" ");
// Connection info to WiFi network
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
//delay(500);
yield();
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
// Print the IP address of client
Serial.println(WiFi.localIP());
// client response callback.
// this endpoint is single callback.
coap.response(callback_response);
// start coap client
coap.start();
//get request to server (arguments ip adrress of server,default port,resource(uri))
int msgid = coap.get(ip,port,"light");
//observe request (arguments ip adrress of server,deafult port,resource name,interger(0) )
//int msgid= coap.observe(ip,port,"light",0);
//reset observe cancel
//int msgid=coap.observecancel(ip,port,"resoucename");
}
//int i=0;
void loop() {
bool state;
// Requests
//get request
//int msgid = coap.get(ip,port,"hello");
//put request
//arguments server ip address,default port,resource name, payload,payloadlength
//int msgid =coap.put(ip,port,"resourcename","0",strlen("0"));
//post request
//arguments server ip address,default port,resource name, payload,payloadlength
//int msgid =coap.post(ip,port,"resourcename","0",strlen("0"));
//delete request
//int msgid = coap.delet(ip,port,"resourcename");
//ping
//int msgid=coap.ping(ip,port);
// int msgid=coap.observe(ip,port,"obs",0);
state= coap.loop();
// Serial.print("state=");
//Serial.println(state);
//if(state==true)
//i=i+1;
//Serial.print("i=");
//Serial.println(i);
//if(i==3)
//{
//Serial.println("cancel observe");
//coap.observeCancel(ip,port,"resourcename");
//}
//Serial.println(msgid);
delay(1000);
}I'm using NodeMCU ESP-12E on Windows and Arduino IDE 1.8.15
https://github.com/automote/ESP-CoAP - This is the library i used
I'm sorry if this is the wrong section, please remove if so.