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Thing was I was looking at all the rest of the code nearby as well.
Total several hours. It was the exact 'wrong' character that I looked
at and kept accepting... Sad

That's usually what happe ...

I must apologize to everyone for my lack of attention.
Yesterday I had found the Timer problem counting approximately 2.5 seconds, to set the variable with problem to 1. My problem was there, I set t ...

I noticed that the flag_emergencia variable changes from 0 to 1 the moment I press the second digit of the password.

Let's say I'm going to enter password 1234, so when I press 1 it stays normal, w ...

Look, I didn't quite understand the fact that changing the position of the variable declaration will affect something. I'll try.

In relation to being creative, I can use what little I know, I can s ...

I added 0x00 at the end of all strings and increased their sizes by 1 character, it worked, but the variable bug still persists.

Well, even though I didn't write the 0x00 at the end of the matrix,
it worked when I tested the send.
Can you show me what that would be like.

See the insertion of 0x00 below.
mystring [0& ...

The reason this works is you re-load this every time before sending,
so the overflow' doesn't cause disaster.

There are lots of similar issues with 'lack of control' of what the data
is doing.
...

Problem is you use sprintf to put the number into the array. A two digit
number needs three characters when stored as a string. Result in fact is that
the first character of sensor will be destroyed ...

There is also a huge problem with the sizes. For example:

if(ID == 255)
{
ID = 0;
}
sprintf(idd,"%u",ID);

Id is allowed to be up to 255. ...

In your text arrays, I notice you never write a final 0x00
to the last byte of the array to terminate the string.
This is required. Examples:
char mystring
You make this mistake with every buffer ...

I'm trying to understand your program.

Can you tell me what is the purpose of your program ? Explain the inputs to
the PIC, and explain how the PIC is supposed to respond to these inputs.
Well, ...

Is your code that you posted the exact program that you are using
to get the flag_emergencia bug ?

Are you secretly turning on WDT and not telling us ?
Your posted code has it commented out. ...

someone please help me with the variable changing value alone.

Now I'm back to pic 16F688, everything is going well in real / virtual.

But one thing is puzzling me.

The flag_emergencia variable starts with a value of 0, so I receive a keep alive via serial ...

Lets just list the problems of the standard software UART:

1) Half duplex only. Can only transmit or receive, not both at the same
time.
2) Has to be called before the character actually arrives ...