espconn.h compile error ipv4_addr_t undefined

[martin-ger]

Basic Infos

• [x ] This issue complies with the issue POLICY doc.
• [x ] I have read the documentation at readthedocs and the issue is not addressed there.
• [x ] I have tested that the issue is present in current master branch (aka latest git).
• [x ] I have searched the issue tracker for a similar issue.
• [x ] If there is a stack dump, I have decoded it.
• [x ] I have filled out all fields below.

Platform

• Hardware: [ESP-12]
• Core Version: [V2.5, 11/2/2019]
• Development Env: [Arduino IDE]
• Operating System: [UbuntuS]

Settings in IDE

• Module: [Wemos D1 mini r2]
• Flash Mode: [dio]
• Flash Size: [4MB]
• lwip Variant: [v1.4|Higher Bandwidth]
• Reset Method: [nodemcu]
• Flash Frequency: [40Mhz]
• CPU Frequency: [80Mhz]
• Upload Using: [SERIAL]
• Upload Speed: [115200] (serial upload only)

Problem Description

Include of espconn.h results in an compiler error (worked in V2.4.2):

In file included from /tmp/arduino_modified_sketch_278302/WiFiClient.ino:2:0:
/home/mfg/.arduino15/packages/esp8266/hardware/esp8266/2.5.0/tools/sdk/include/espconn.h:451:54: error: 'ipv4_addr_t' has not been declared
 typedef void (*dns_found_callback)(const char *name, ipv4_addr_t *ipaddr, void *callback_arg);
                                                      ^

Following addition in espconn.h solves it:

#ifndef ipv4_addr_t
#define ipv4_addr_t ip_addr_t
#endif

MCVE Sketch

#include <Arduino.h>
#include <espconn.h>

void setup() {

}

void loop() {

}

Debug Messages

Debug messages go here

[pfeerick]

Edit: Removed first bit as is was my addition to IPAddress.h that got it working... after line 34 may be a good place to add #define ipv4_addr_t ip_addr_t as ipv4_addr is there also...

Arduino/cores/esp8266/IPAddress.h

Line 34 in 9790e1c

#define ipv4_addr ip_addr

Is espconn supposed to work with LWIP1.4 though? ... as the commit that added espconn states "lwip2: port esp-ping and espconn"

[devyte]

@d-a-v I suspect this can be closed. Do we still support the espconn layer?

[d-a-v]

espconn is supported by lwIP-1.4
it is not officially supported by lwip2, but it is ported and untested.
espconn_init() has to be called before using it with lwip2.

@pfeerick do you intend to make a PR with your proposed update ?

[pfeerick]

@d-a-v Probably should do... completely forgot about this as the OP never replied. I'll test this again and push the change if it's still needed.