Comments (4)
wfdudley
commented on July 27, 2024
Can you explain more about this problem? What is wrong with calling WiFi.onEvent() multiple times? Does it constitute a memory leak?
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FedericoBusero
commented on July 27, 2024
The memory allocation will grow each time you call onEvent: it will add a function to the onEvent-callback-list. If you have run the NTP-app 100 times, you will have 100 functions in the onEvent callback list. This means that if you get a connection, the function "WiFiEvent" will be called 100 times!
You can see this in the debug window, you will see the following list growing
WiFi connected! IP address: ...
WiFi connected! IP address: ...
WiFi connected! IP address: .....
WiFi connected! IP address: .....
WiFi connected! IP address: .....
Solution
- only call WiFi.onEvent once
OR - call Wifi.removeEvent when finished
WiFiEventId_t eventID = WiFi.onEvent(WiFiEvent);
...
WiFi.removeEvent(eventID);
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wfdudley
commented on July 27, 2024
Thanks for the explanation. I like the "removeEvent()" solution. I'll
work on that.
And thanks again for all your help.
Bill Dudley
This email is free of malware because I run Linux.
…On Mon, Jan 4, 2021 at 11:49 AM FedericoBusero ***@***.***> wrote:
The memory allocation will grow each time you call onEvent: it will add a
function to the onEvent-callback-list. If you have run the NTP-app 100
times, you will have 100 functions in the onEvent callback list. This means
that if you get a connection, the function "WiFiEvent" will be called 100
times!
You can see this in the debug window, you will see the following list
growing
WiFi connected! IP address: ...
WiFi connected! IP address: ...
WiFi connected! IP address: .....
WiFi connected! IP address: .....
WiFi connected! IP address: .....
Solution
- only call WiFi.onEvent once
OR
- call Wifi.removeEvent when finished
WiFiEventId_t eventID = WiFi.onEvent(WiFiEvent);
...
WiFi.removeEvent(eventID);
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wfdudley
commented on July 27, 2024
fixed with today's commit. I used WiFi.removeEvent().
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