ESP32 Forum • ESP-NOW Mac Address compile error

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ESP-NOW Mac Address compile error

Posted: Sun Feb 14, 2021 12:07 pm

by chuck808

Hello,

Trying to run the samples from https://randomnerdtutorials.com/esp-now ... duino-ide/ Getting Started with ESP-NOW (ESP32 with Arduino IDE), but keep running into compile error. The board I am using is the ESP-WROON-32 dev board.

If I run the sketches with

Code: [Select all] [Expand/Collapse]

// REPLACE WITH YOUR RECEIVER MAC Address
uint8_t broadcastAddress[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

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, everything runs as expected.

However, if I replace the broadcast address with the Mac Address of the receiver

Code: [Select all] [Expand/Collapse]

// REPLACE WITH YOUR RECEIVER MAC Address
uint8_t broadcastAddress[] = {AC:67:B2:26:5D:78};

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, I get the following error message.

Code: [Select all] [Expand/Collapse]

Arduino: 1.8.13 (Windows 10), 
Board: "ESP32 Dev Module, 
Disabled, 
Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS), 
240MHz (WiFi/BT), 
QIO, 80MHz, 
4MB (32Mb), 
921600, 
None"
 
sketch_feb14a:16:36: error: expected '}' before ':' token
 
 uint8_t broadcastAddress[] = {AC:67:B2:26:5D:78};                               ^
 
sketch_feb14a:16:36: error: name 'AC' used in a GNU-style designated initializer for an array
 
sketch_feb14a:16:36: error: expected ',' or ';' before ':' token
 
sketch_feb14a:16:48: error: expected declaration before '}' token
 
 uint8_t broadcastAddress[] = {AC:67:B2:26:5D:78};                                            ^
 
Multiple libraries were found for "WiFi.h"
 
 Used: C:\Users\name\AppData\Local\Arduino15\packages\esp32\hardware\esp32\1.0.4\libraries\WiFi
 
 Not used: C:\Program Files (x86)\Arduino\libraries\WiFi
 
exit status 1
 
expected '}' before ':' token

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I have read some posts that suggest removing one of the instances of "WiFI.h", but that doesn't fix the issue.

Any suggestions?

Thanks

Re: ESP-NOW Mac Address compile error

Posted: Sun Feb 14, 2021 12:52 pm

by ChrisMCU

Code: [Select all] [Expand/Collapse]

uint8_t broadcastAddress[] = {AC:67:B2:26:5D:78};

GeSHi © Codebox Plus Extension

should be:

Code: [Select all] [Expand/Collapse]

uint8_t broadcastAddress[] = {0xAC, 0x67, 0xB2, 0x26, 0x5D, 0x78};

GeSHi © Codebox Plus Extension

Re: ESP-NOW Mac Address compile error

Posted: Sun Feb 14, 2021 3:28 pm

by lbernstone

"AC" is a string. 0xAC is a uint8_t.

Re: ESP-NOW Mac Address compile error

Posted: Sun Feb 14, 2021 9:25 pm

by chuck808

Hello lbernstone,

What an idiot I am.

Thanks