Hi there,
I'm attempting to connect my esp8266 (wemos d1 mini) to wia. I'm following this tutorial for the esp8166: https://developers.wia.io/v1.0/docs/espressif-esp8266
When I try to verify the sketch, I'm getting the error "Cannot allocate an object of abstract type 'HttpClient'.
I've added the ESP package under "additional boards manager urls", and have made sure the arduinoJSON and arduinoHttpClient packages are installed.
I've tried switching to different versions of the arduinoHttpClient pacakge.
Thanks for any help!
Full error message:
Arduino: 1.8.8 (Mac OS X), Board: "LOLIN(WEMOS) D1 R2 & mini, 80 MHz, Flash, Enabled, 4M (no SPIFFS), v2 Lower Memory, Disabled, None, Only Sketch, 921600"
In file included from /Users/jamie/Documents/Arduino/libraries/ArduinoHttpClient/src/ArduinoHttpClient.h:8:0,
from /Users/jamie/Documents/Projects/Remoter Box/wia_test_event/wia_test_event.ino:4:
/Users/jamie/Documents/Arduino/libraries/ArduinoHttpClient/src/HttpClient.h: In member function 'virtual void HttpClient::flush()':
/Users/jamie/Documents/Arduino/libraries/ArduinoHttpClient/src/HttpClient.h:296:50: error: return-statement with a value, in function returning 'void' [-fpermissive]
virtual void flush() { return iClient->flush(); };
^
/Users/jamie/Documents/Projects/Remoter Box/wia_test_event/wia_test_event.ino: At global scope:
wia_test_event:18:56: error: cannot allocate an object of abstract type 'HttpClient'
HttpClient httpClient = HttpClient(client, server, port);
^
In file included from /Users/jamie/Documents/Arduino/libraries/ArduinoHttpClient/src/ArduinoHttpClient.h:8:0,
from /Users/jamie/Documents/Projects/Remoter Box/wia_test_event/wia_test_event.ino:4:
/Users/jamie/Documents/Arduino/libraries/ArduinoHttpClient/src/HttpClient.h:39:7: note: because the following virtual functions are pure within 'HttpClient':
class HttpClient : public Client
^
In file included from /Users/jamie/Applications/Arduino.app/Contents/Java/hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/WiFiClient.h:27:0,
from /Users/jamie/Applications/Arduino.app/Contents/Java/hardware/esp8266com/esp8266/libraries/ESP8266WiFi/src/ESP8266WiFi.h:39,
from /Users/jamie/Documents/Projects/Remoter Box/wia_test_event/wia_test_event.ino:3:
/Users/jamie/Applications/Arduino.app/Contents/Java/hardware/esp8266com/esp8266/cores/esp8266/Client.h:29:21: note: virtual int Client::connect(const IPAddress&, uint16_t)
virtual int connect(CONST IPAddress& ip, uint16_t port) =0;
^
/Users/jamie/Applications/Arduino.app/Contents/Java/hardware/esp8266com/esp8266/cores/esp8266/Client.h:37:22: note: virtual bool Client::flush(unsigned int)
virtual bool flush(unsigned int maxWaitMs = 0) = 0;
^
/Users/jamie/Applications/Arduino.app/Contents/Java/hardware/esp8266com/esp8266/cores/esp8266/Client.h:38:22: note: virtual bool Client::stop(unsigned int)
virtual bool stop(unsigned int maxWaitMs = 0) = 0;
^
wia_test_event:18:12: error: cannot declare variable 'httpClient' to be of abstract type 'HttpClient'
HttpClient httpClient = HttpClient(client, server, port);
^
In file included from /Users/jamie/Documents/Arduino/libraries/ArduinoHttpClient/src/ArduinoHttpClient.h:8:0,
from /Users/jamie/Documents/Projects/Remoter Box/wia_test_event/wia_test_event.ino:4:
/Users/jamie/Documents/Arduino/libraries/ArduinoHttpClient/src/HttpClient.h:39:7: note: since type 'HttpClient' has pure virtual functions
class HttpClient : public Client
^
/Users/jamie/Documents/Projects/Remoter Box/wia_test_event/wia_test_event.ino: In function 'void postToWia(ArduinoJson::JsonObject&)':
wia_test_event:59:14: error: 'class HttpClient' has no member named 'beginBody'
httpClient.beginBody();
^
exit status 1
cannot allocate an object of abstract type 'HttpClient'
This report would have more information with
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option enabled in File -> Preferences.
