ESP8266 Community Forum

Posted: **Mon Nov 27, 2017 5:35 pm**

Code:

/* RestClient simple GET request
 *
 * by Chris Continanza (csquared)
 */

#include <Ethernet.h>
#include <SPI.h>
#include "RestClient.h"

RestClient client = RestClient("localhost:20949/RestService");

//Setup
void setup() {
  Serial.begin(9600);
  // Connect via DHCP
  Serial.println("connect to network");
  client.dhcp();
/*
  // Can still fall back to manual config:
  byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
  //the IP address for the shield:
  byte ip[] = { 192, 168, 2, 11 };
  Ethernet.begin(mac,ip);
*/
  Serial.println("Setup!");
}

String response;
void loop(){
  response = "";
  int statusCode = client.get("/get", &response);
  Serial.print("Status code from server: ");
  Serial.println(statusCode);
  Serial.print("Response body from server: ");
  Serial.println(response);
  delay(1000);
}

Error messages:

Code: Select all

Archiving built core (caching) in: C:\Users\barte\AppData\Local\Temp\arduino_cache_923006\core\core_esp8266_esp8266_nodemcuv2_CpuFrequency_80,UploadSpeed_115200,FlashSize_4M3M_7b3e88992d3c2979d0fdbc9fc6d2ed2e.a
sketch\RestClient.cpp.o:(.text._ZN10RestClient4dhcpEv+0xc): undefined reference to `RestClient::begin(unsigned char*)'

sketch\RestClient.cpp.o: In function `RestClient::dhcp()':

sketch/RestClient.cpp:70: undefined reference to `RestClient::begin(unsigned char*)'

collect2.exe: error: ld returned 1 exit status

exit status 1
Error compiling for board NodeMCU 1.0 (ESP-12E Module).

I can't figure out what's going on. Could you help me?

Posted: **Tue Nov 28, 2017 1:00 pm**

Err, it's telling you what the error is, from the compiler isn't it?
It's reporting:
undefined reference to `RestClient::begin(unsigned char*)

It can't be much more self explanatory : There is no function called that according to the compiler (to be exact, the linker). And, you are not helping by not stating where you got this restclient library from. I have just googled and there are numerous versions, some which have a dhcp method and some that don't. I get a fully feeling you have bits and pieces of different restclient libraries installed.

ESP8266 Community Forum

Error when compiling for board NodeMCU. Please help.

Error when compiling for board NodeMCU. Please help.

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