Esp8266 (Arduino) support #30

Gabeki17 · 2020-06-21T17:15:41Z

Hello All,

I am having a bunch of esp8266 room thermostats in my flat.
I wuld also like to make them controlling my airconditionig system.

I did a quick try on this already, but to be honest, I am not experienced enough on encrypting.

Are you able to help me doing this?

Thank you very much in advance!

All the best,
Gábor

jllcunha · 2020-06-21T17:25:44Z

For this kind of project, perhaps Openhab would be a good option? There is a binding for gree air conditioners On 21 Jun 2020, at 19:15, Gabeki17 <[email protected]> wrote: Hello All, I am having a bunch of esp8266 room thermostats in my flat. I wuld also like to make them controlling my airconditionig system. I did a quick try on this already, but to be honest, I am not experienced enough on encrypting. Are you able to help me doing this? Thank you very much in advance! All the best, Gábor — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub<#30>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AIAM45OYS4SJWQCZE7ZTPGTRXY54TANCNFSM4OD6IGVQ>.

Gabeki17 · 2020-06-21T17:58:37Z

Thx!

I think I have found your suggestion:

https://github.com/jllcunha/openhab-greeair-binding

I feal still quite far away, but this might helps a little! :)

All the best,
Gábor

For this kind of project, perhaps Openhab would be a good option? There is a binding for gree air conditioners On 21 Jun 2020, at 19:15, Gabeki17 [email protected] wrote: Hello All, I am having a bunch of esp8266 room thermostats in my flat. I wuld also like to make them controlling my airconditionig system. I did a quick try on this already, but to be honest, I am not experienced enough on encrypting. Are you able to help me doing this? Thank you very much in advance! All the best, Gábor — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub<#30>, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AIAM45OYS4SJWQCZE7ZTPGTRXY54TANCNFSM4OD6IGVQ.

tomikaa87 · 2020-06-21T18:11:12Z

Hello All,

I am having a bunch of esp8266 room thermostats in my flat.
I wuld also like to make them controlling my airconditionig system.

I did a quick try on this already, but to be honest, I am not experienced enough on encrypting.

Are you able to help me doing this?

Thank you very much in advance!

All the best,
Gábor

Hi Gabor,

If you want to control the AC directly from the ESP, I suggest using this library for the AES encryption: https://github.com/kakopappa/arduino-esp8266-aes-lib

Unfortunately, at the moment I don't have a lightweight C++ protocol library that can run on the ESP (the current implementation uses Qt which is too heavy for this controller).

Since the protocol doesn't need anything other than an encryption library and a JSON library (I prefer https://github.com/nlohmann/json which is header-only and lightweight), maybe you can try to write a simple program that communicates with the AC.

I have plans to simplify the current C++ implementation to be able to compile it on the ESP, but I don't have any ETA.

jllcunha · 2020-06-21T18:12:46Z

I know there is a newer version of this binding. Since i no longer have a gree air conditioner i was unable to continue working on this and i passed the code on On 21 Jun 2020, at 19:58, Gabeki17 <[email protected]> wrote: Thx! I think I have found your suggestion: https://github.com/jllcunha/openhab-greeair-binding<url> I feal still quite far away, but this might helps a little! :) All the best, Gábor For this kind of project, perhaps Openhab would be a good option? There is a binding for gree air conditioners On 21 Jun 2020, at 19:15, Gabeki17 [email protected]<mailto:[email protected]> wrote: Hello All, I am having a bunch of esp8266 room thermostats in my flat. I wuld also like to make them controlling my airconditionig system. I did a quick try on this already, but to be honest, I am not experienced enough on encrypting. Are you able to help me doing this? Thank you very much in advance! All the best, Gábor — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub<#30<#30>>, or unsubscribehttps://github.com/notifications/unsubscribe-auth/AIAM45OYS4SJWQCZE7ZTPGTRXY54TANCNFSM4OD6IGVQ. — You are receiving this because you commented. Reply to this email directly, view it on GitHub<#30 (comment)>, or unsubscribe<https://github.com/notifications/unsubscribe-auth/AIAM45O26LGX5E4ONLHHT4TRXZC5RANCNFSM4OD6IGVQ>.

Gabeki17 · 2020-06-21T18:23:01Z

Hello All,
I am having a bunch of esp8266 room thermostats in my flat.
I wuld also like to make them controlling my airconditionig system.
I did a quick try on this already, but to be honest, I am not experienced enough on encrypting.
Are you able to help me doing this?
Thank you very much in advance!
All the best,
Gábor

Hi Gabor,

If you want to control the AC directly from the ESP, I suggest using this library for the AES encryption: https://github.com/kakopappa/arduino-esp8266-aes-lib

Unfortunately, at the moment I don't have a lightweight C++ protocol library that can run on the ESP (the current implementation uses Qt which is too heavy for this controller).

Since the protocol doesn't need anything other than an encryption library and a JSON library (I prefer https://github.com/nlohmann/json which is header-only and lightweight), maybe you can try to write a simple program that communicates with the AC.

I have plans to simplify the current C++ implementation to be able to compile it on the ESP, but I don't have any ETA.

Thank you!

I will give it a try soon!

So for example I just encryt the scan text:

{
"t": "scan"
}

and sending it as udp broadcast on port 7000?

tomikaa87 · 2020-06-21T19:11:21Z

So for example I just encryt the scan text:

{
"t": "scan"
}

and sending it as udp broadcast on port 7000?

The scan packet must not be encrypted, but must be sent in plain text. The answer from the device(s) will contain the encrypted response which can be decoded and decrypted with the generic encryption key.

If you want to send an encrypted packet to the device, the encryption should be done in this way:

Create the JSON data you want to send
Pad the data using PKCS#7 method
Encrypt the data with the device-specific encryption key
Encode the ciphertext into base-64

For an easy to read implementation, you can check the python CLI: https://github.com/tomikaa87/gree-remote/blob/master/PythonCLI/gree.py

PKCS-7 padding: https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS#5_and_PKCS#7

Padding example from the C++ library:

void addPKCS7Padding(QByteArray& packBase64)
{
    auto length = 16 - (packBase64.length() % 16);
    packBase64.append(QByteArray(length, length));
}

Gabeki17 · 2020-06-25T10:17:32Z

So for example I just encryt the scan text:
{
"t": "scan"
}
and sending it as udp broadcast on port 7000?

The scan packet must not be encrypted, but must be sent in plain text. The answer from the device(s) will contain the encrypted response which can be decoded and decrypted with the generic encryption key.

If you want to send an encrypted packet to the device, the encryption should be done in this way:

Create the JSON data you want to send

Pad the data using PKCS#7 method

Encrypt the data with the device-specific encryption key

Encode the ciphertext into base-64

For an easy to read implementation, you can check the python CLI: https://github.com/tomikaa87/gree-remote/blob/master/PythonCLI/gree.py

PKCS-7 padding: https://en.wikipedia.org/wiki/Padding_(cryptography)#PKCS#5_and_PKCS#7

Padding example from the C++ library:
void addPKCS7Padding(QByteArray& packBase64)
{
    auto length = 16 - (packBase64.length() % 16);
    packBase64.append(QByteArray(length, length));
}

Thank you,

UDP and json part was easy. My airconditioner responds nice.

AES is a pain for me.

I have tried the suggested lib. (Dont understand how it works exactly. I think taht is the main issue.)

I am not getting the same resoult as I should.

Referrence tool I have used: https://www.devglan.com/online-tools/aes-encryption-decryption

Test code:
`#include <AESLib.h>

AESLib aesLib;

void setup() {
Serial.begin(115200);
Serial.println("\nBooting...");

String AES_Key = "a3K8Bx%2r8Y7#xDh";
byte key[AES_Key.length()];
AES_Key.getBytes(key, AES_Key.length()+1);
// byte key[] = { 0x2B, 0x7E, 0x15, 0x16, 0x28, 0xAE, 0xD2, 0xA6, 0xAB, 0xF7, 0x15, 0x88, 0x09, 0xCF, 0x4F, 0x3C };

// put your setup code here, to run once:
byte my_iv[N_BLOCK] = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
// aesLib.gen_iv(my_iv);

Serial.println("AES Key: ");
int i;
for (i = 0; i < sizeof(my_iv); i++)
{
// my_iv[i] = key[i];
Serial.print(my_iv[i], DEC);
Serial.print(",");
}
Serial.println("");

for (i = 0; i < sizeof(key); i++)
{
Serial.print(key[i], DEC);
Serial.print(",");
}
Serial.println("");

String msg = "i hate dogs";

unsigned long ms = micros ();
String encMsg = aesLib.encrypt(msg, key, my_iv);
Serial.print("Encryption took: ");
Serial.println(micros() - ms);
Serial.println("encMsg: " + encMsg);

///aesLib.decrypt(encMsg, key, my_iv);
}

void loop() {
// put your main code here, to run repeatedly:

}`

Gabeki17 · 2020-06-27T08:36:34Z

I think I will not be able to fix this myself within reasonable time and without learning for days. I might hand over the encryption part to my RPI as a workaround for now (simply throwing over the messages and receiving back the encripted or decripted text) and when done I can still do the brainstorming on this.

I really apprisiate all your help on this!

Thank you all! :)

Gabeki17 · 2020-06-30T14:44:28Z

The Raspberry PI as encrypter and decrypter server is funcioning already. Works perfect! The rest should not be hard. :)

Gabeki17 · 2020-07-03T13:59:11Z

All is working now!

Thank you very much!

All the best,
Gábor

tomikaa87 · 2020-07-05T11:07:27Z

@Gabeki17

Hi Gábor,

Thanks for the info. At the moment I have some time to test the encryption on the ESP and implement a minimal working program based on your code.

Regards,
Tamás

tomikaa87 · 2020-07-05T16:58:32Z

@Gabeki17

I've began implementing the ESP8266 version, you can find the sources here: https://github.com/tomikaa87/gree-remote/tree/master/GreeESP8266

Unfortunately it can't bind to a device, yet. I'm working on it.
Encryption and decryption works fine (I've checked the generated payloads, they match with PythonCLI), but for some strange reason, after sending the bind request, I don't get an answer on the socket. It's probably some trivial issue I can't see right now.

The project uses Platform.io and it's not a regular Arduino sketch. You can easily open it via Visual Studio Code. Install the Platform.io extension. After that you must install the ESP8266 framework by following these steps:

on the Platform.io Home page, select Platforms
go to the Embedded tab
type "espressif 8266" in the search bar
click on the search result
click on the Install button

Gabeki17 · 2020-08-12T19:57:30Z

@Gabeki17

I've began implementing the ESP8266 version, you can find the sources here: https://github.com/tomikaa87/gree-remote/tree/master/GreeESP8266

Unfortunately it can't bind to a device, yet. I'm working on it.
Encryption and decryption works fine (I've checked the generated payloads, they match with PythonCLI), but for some strange reason, after sending the bind request, I don't get an answer on the socket. It's probably some trivial issue I can't see right now.

The project uses Platform.io and it's not a regular Arduino sketch. You can easily open it via Visual Studio Code. Install the Platform.io extension. After that you must install the ESP8266 framework by following these steps:

on the Platform.io Home page, select Platforms

go to the Embedded tab

type "espressif 8266" in the search bar

click on the search result

click on the Install button

Cool Thx!

Unfortunately my thermostates are written in Arduino (Thousands of lines.)
So I am still using my RPI as an encription/decription server.

Also I was thinking, as I already use my RPI why not try to make use of your Python script.
On the Pi I am having errors wit that. So Still my original way.... :)

Also was to mention that I am really enjoying your responsiveness!
Thank you!

All the best,
Gábor

Gabeki17 · 2021-11-30T18:40:52Z

Hi,

Long time since.

As I did not find any working AES ECB 128 PKCS capable library, I have started to make my own.
It is now ready.
Not yet a library, but it will be soon.

Also the Base64 libs I have found, on github/internet, failed on the Gree generated responses some times.

Because of this bad experience, I have also coded Base64.
This I have just changed to a library.

Let me know if you are interested.

Afer all this, the road is cleared for an Arduinio ide based ESP8266 controler.
In my case my already present room thermostats. :)

All the best,
Gábor

tomikaa87 · 2022-01-09T10:36:23Z

@Gabeki17

That's great news! If you happen to have a repository with the working code, I can link it to the main documentation, or if you want, you can create a PR and I'll merge your solution into this repository (in that case, you should add your author info to the header of the source files).

Gabeki17 changed the title ~~Esp8266 (Arduno) support~~ Esp8266 (Arduino) support Jun 21, 2020

tomikaa87 added the enhancement label Jan 9, 2022

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Esp8266 (Arduino) support #30

Esp8266 (Arduino) support #30

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Esp8266 (Arduino) support #30

Esp8266 (Arduino) support #30

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