Hello after trying hard I have managed to get up and running and communicate with the ESP8266 . Sending a UDP packet to ESP , ESP spits out on the UART : +IPD,5:Hello or +IPD,13:Hello, Again! what is the best way to extract from the reply : Hello or Hello, Again! ? I put the answer from ESP into...

Use functions from the standard library: sscanf .

I would use flex + bison Merry Christmas. Albert

ok but how to use sscanf with volatile uint8_t array ? (I receive the data in an interrupt)

what is the difference between a volatile uint8_t array and a char[] array according to you? Is the memory cell where the uint8_t is different from the cell where the char is? Obviously when using sscanf you need to be sure!!! of course when using sscanf you have to be sure that you have the whole message in the buffer, not half of it, and that you will scan the other half in a second pass - this is not possible... Personally I would not use sscanf for this purpose, but it is the simplest method. I understand that you have some kind of circular buffer in this interrupt.

@Piotrus_999 Obviously nonsense. The sscanf function returns a value. It is sufficient for the buffer to be null terminated. The algorithm is simple: - you collect characters in the buffer until you get an end-of-line character - add an '-' at the end - fire sscanf like this: Code: C / C++Log in, to see the code @Piotrus_999 You were supposed to write a parser for this sort of thing. Why don't you upload it here then we'll see how much better it is than sscanf.

what is nonsense? That it has to have the whole message in order to scan? And not e.g.; +IPD,13:Hel and in the second reading lo, Again! I don't know what you mean.

The point is that your use case is from outer space. Data over the UART comes in sequentially, byte by byte, not in packets: +IPD,13:Hel , lo, Again! .

It depends on how and when it reads the buffer. You don't know that. that's why I wrote him to make sure he had the whole message and not part of it to scanf. you're making up problems.

How to extract data from the ESP8266 response: +IPD,5:Hello or +IPD,13:Hello, Again!

rafikAVR 1770 8

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#1 15551861 24 Mar 2016 14:45

rafikAVR rafikAVR

Level 16

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Post #1
15551861 24 Mar 2016 14:45

Hello
after trying hard I have managed to get up and running and communicate with the ESP8266 .
Sending a UDP packet to ESP , ESP spits out on the UART :
+IPD,5:Hello
or
+IPD,13:Hello, Again!

what is the best way to extract from the reply : Hello or Hello, Again! ?

I put the answer from ESP into arrays ,
but type checking :
buffor[0] == "+" && buffor[1] == "I" .... up to "," then there can be 2 numbers and each in a different place in the array (how do I put buffor[5] = 1 and buffor[6] = 3 into number 13 in order to extract the data calmly afterwards ?)
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#2 15552116 24 Mar 2016 16:29

grko grko

Level 33

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Post #2
15552116 24 Mar 2016 16:29

Use functions from the standard library: sscanf .
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#3 15552150 24 Mar 2016 16:47

Anonymous Anonymous

Anonymous

» |

Post #3
15552150 24 Mar 2016 16:47

I would use flex + bison

Merry Christmas.
Albert
#4 15552585 24 Mar 2016 19:37

rafikAVR rafikAVR

Level 16

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Post #4
15552585 24 Mar 2016 19:37

GrzegorzKostka wrote:
Use functions from the standard library: sscanf .

ok
but how to use sscanf with volatile uint8_t array ?
(I receive the data in an interrupt)
#5 15552650 24 Mar 2016 19:54

Anonymous Anonymous

Anonymous

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Post #5
15552650 24 Mar 2016 19:54

what is the difference between a volatile uint8_t array and a char[] array according to you? Is the memory cell where the uint8_t is different from the cell where the char is?

Obviously when using sscanf you need to be sure!!! of course when using sscanf you have to be sure that you have the whole message in the buffer, not half of it, and that you will scan the other half in a second pass - this is not possible...

Personally I would not use sscanf for this purpose, but it is the simplest method.

I understand that you have some kind of circular buffer in this interrupt.
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#6 15552967 24 Mar 2016 21:26

grko grko

Level 33

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Post #6
15552967 24 Mar 2016 21:26

@Piotrus_999
Quote:

Of course when using sscanf you must be sure!!! Of course when using sscanf you have to be sure that you have the whole message in the buffer and not, for example, half of it, and that you will scan the next half in the second scan - this is not possible....

Obviously nonsense. The sscanf function returns a value. It is sufficient for the buffer to be null terminated. The algorithm is simple:
- you collect characters in the buffer until you get an end-of-line character
- add an '-' at the end
- fire sscanf like this:

Code: C / C++
Log in, to see the code

@Piotrus_999 You were supposed to write a parser for this sort of thing. Why don't you upload it here then we'll see how much better it is than sscanf.
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#7 15553077 24 Mar 2016 21:57

Anonymous Anonymous

Anonymous

» |

Post #7
15553077 24 Mar 2016 21:57

GrzegorzKostka wrote:
Of course nonsense.

what is nonsense? That it has to have the whole message in order to scan? And not e.g.; "+IPD,13:Hel" and in the second reading "lo, Again!"

I don't know what you mean.
#8 15553155 24 Mar 2016 22:27

grko grko

Level 33

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Post #8
15553155 24 Mar 2016 22:27

Quote:

what is nonsense? that it has to have the whole message to scan? and not e.g.; "+IPD,13:Hel" and in the second reading "lo, Again!"

I don't know what you mean.

The point is that your use case is from outer space. Data over the UART comes in sequentially, byte by byte, not in packets: "+IPD,13:Hel" , "lo, Again!" .
#9 15553170 24 Mar 2016 22:32

Anonymous Anonymous

Anonymous

» |

Post #9
15553170 24 Mar 2016 22:32

It depends on how and when it reads the buffer. You don't know that. that's why I wrote him to make sure he had the whole message and not part of it to scanf. you're making up problems.
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