ESP8266 Community Forum

Posted: **Mon Sep 14, 2020 5:04 am**

Hello.

I have some kind of smart home on multiple esp8266, and I periodically update code of their firmwares via OTA.
And sometimes I forget to upload actual code on them. For example, I don't remember, if I uploaded a new version of firmware to esp8266, that serves in toilet

.

Each of esp8266 firmware is *.bin file, if I understood it correctly. Each of file has time of creation.
And question is - does esp8266 stores date and time of firmware, uploaded via OTA (or update) and is there any Arduino program method to get that date and time?

Posted: **Wed Sep 16, 2020 3:21 am**

The gcc option -D NAME defines a preprocessor macro NAME from the command line

I use it to generate the firmware version at compile time

the following example works on linux, and I'm not using Arduino, so checkout if you can adapt it to your environment

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the following compiler flag defines a preprocessor macro with the git version

-DAPP_RELEASE=\"$($(shell git --no-pager describe --tags --always --dirty))\"

changing it to 
-DFILE_DATE=\"$($(shell date))\"

it's like you define the following
#define FILE_DATE "current_date"
and you can then use the macro FILE_DATE inside your code

Posted: **Wed Sep 16, 2020 9:32 am**

GCC has builtin variables to do the same thing, example :

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sprintf(str, "Build Version : %s %s \r\n", __DATE__, __TIME__ );

Posted: **Wed Sep 16, 2020 9:40 am**

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GCC has builtin variables to do the same thing, example :
CODE: SELECT ALL
sprintf(str, "Build Version : %s %s \r\n", __DATE__, __TIME__ );

Ya, easier and without the extra flags...

ESP8266 Community Forum

How to get date and time of uploaded firmware?

How to get date and time of uploaded firmware?

Re: How to get date and time of uploaded firmware?

Re: How to get date and time of uploaded firmware?

Re: How to get date and time of uploaded firmware?