How to pair ELM327 with password?

[naamah75]

How do I pair an ELM327 bluetooth adapter that asks for a PIN?
A Bluetooth information section on the Info page would also be useful

[adlerre]

This is not currently supported. However, it is possible to implement it.
Which dongle should be used? (to get one)

[naamah75]

I don't remember the model well, but it is a common ELM327 of those of which you can find plenty on Amazon. I did a short search, again on Amazon and it seems that they all require a PIN like 1234 or 0000

[naamah75]

Do you think that such a modification, which is very crude, would be fine

if (!serialBt.begin("OBD2MQTT", true)) { Serial.println("========== serialBT failed!"); ESP.restart(); } serialBt.setPin("1234");

... into the obd.cpp

[adlerre]

I don't remember the model well, but it is a common ELM327 of those of which you can find plenty on Amazon. I did a short search, again on Amazon and it seems that they all require a PIN like 1234 or 0000

I have tested some, but none required a pin.

Do you think that such a modification, which is very crude, would be fine

if (!serialBt.begin("OBD2MQTT", true)) { Serial.println("========== serialBT failed!"); ESP.restart(); } serialBt.setPin("1234");

... into the obd.cpp

Yes, this would work. But I would add this to settings page and set if not empty.

[naamah75]

Perfect! So could you recommend some model of adapter that you have tried and does not require pins? in any case as soon as I have a way, if you want, I will write you the model of my ELM327 adapter

Yes, implementing the configuration on the home screen looks good and that's what I was trying to do, but it's your code! And surely you will be better, it takes me much longer to understand where to put my hands

[adlerre]

Perfect! So could you recommend some model of adapter that you have tried and does not require pins? in any case as soon as I have a way, if you want, I will write you the model of my ELM327 adapter

https://www.amazon.de/dp/B0BG4W6MLD
https://www.amazon.de/dp/B0D474RC4W

[naamah75]

Thank you for your patience, you were very kind. Do you think you can change the PIN in the settings in the near future?

[naamah75]

[naamah75]

the modification i made doesn't work, the device is detected with its mac address, but with name "0" instead of "OBDII"... i don't know if this can help. Anyway the bluetooth connection doesn't happen. If i can help you with the tests let me know!

I don't remember the model well, but it is a common ELM327 of those of which you can find plenty on Amazon. I did a short search, again on Amazon and it seems that they all require a PIN like 1234 or 0000

I have tested some, but none required a pin.

Do you think that such a modification, which is very crude, would be fine
if (!serialBt.begin("OBD2MQTT", true)) { Serial.println("========== serialBT failed!"); ESP.restart(); } serialBt.setPin("1234");
... into the obd.cpp

Yes, this would work. But I would add this to settings page and set if not empty.

[adlerre]

Have you tested with PR #54? Can you provide some logs?

[naamah75]

Hi, sorry for the delay, but I only had the chance to try the bt-pin branch now.
I had some compilation problems with PlatformIO on Windows due to problems related to the git parameter environment to publish the version on the main page and then to compile the UI and transfer it to the LittleFS partition, if you want I'll post the solution I found; anyway I did it in the end.
Setting the PIN and saving the options works at program level, but I imagine you've tried this too. Unfortunately, however, the bluetooth does not connect to the ELM327 adapter.

Here are the logs of a couple of attempts I made...

First I set the bluetooth device name and MAC address directly in the settings page. The strange thing I noticed is that the MAC address is correct, while the name is displayed as "0" instead of "OBDII" (which I saved in the settings):

Start modem... 
Initializing modem... 
Modem Name: A7670E-FASE
Modem Info: Manufacturer: SIMCOM INCORPORATED Model: A7670E-FASE Revision: A7670M7_V1.11.1 IMEI: 862771076817991
Waiting for network......success 
Network connected 
Connecting to TM......success 
GPRS connected 
IP Address: 10.6.7.213
Enabling GPS/GNSS/GLONASS......success 
scanned for services, found 0
connecting to 00:0d:18:a0:4e:35 - 0
Couldn't connect to OBD scanner - Phase 1 
Restarting OBD connect. 
scanned for services, found 0
connecting to 00:0d:18:a0:4e:35 - 0
Couldn't connect to OBD scanner - Phase 1 
Disconnected

As a second test I deleted the device name and MAC address and let it search for devices, and I noticed that the ELM327 bluetooth adapter I have is not detected.

Initializing modem... 
Modem Name: A7670E-FASE
Modem Info: Manufacturer: SIMCOM INCORPORATED Model: A7670E-FASE Revision: A7670M7_V1.11.1 IMEI: 862771076817991
Waiting for network......success 
Network connected 
Connecting to TM......success 
GPRS connected 
IP Address: 10.6.207.130
Enabling GPS/GNSS/GLONASS......success 
Discover Bluetooth devices... 
>>>>>>>>>>>Found a new device: Name: OPPO A17, Address: 74:86:69:ae:d6:44, cod: 0x5a020c, rssi: -83
>>>>>>>>>>>Found a new device: Name: CITROEN, Address: 48:f0:7b:da:bb:1b, cod: 0x360408, rssi: -43
Stopping discover...stopped 
Search device: OBDII
Couldn't connect to OBD scanner - Phase 1 
Disconnected

Can I help you with some more attempts?

[naamah75]

This is not currently supported. However, it is possible to implement it. Which dongle should be used? (to get one)

For this model the manufacturer states that you must enter the PIN:
Vgate iCar Pro Bluetooth 4.0 (BLE)

For the model you suggested, which does not use a PIN, however, I read that you have to press the power button every time and it does not start automatically with the car; is that so?
Vgate iCar2 BLE 4.0

Googling a bit I noticed conflicting opinions of users who said that for the same, for some users the PIN was required and for other users not; I discovered that the discriminating thing for many is the operating system of the smartphone, it seems that the pairing for Apple is very often without PIN (I use android)

for example in this video, which if I'm not mistaken is from the adapter we were talking about, the user enters a PIN:
Youtube VGATE iCar2 Bluetooth 3.0 ELM327 OBD2

[adlerre]

For this model the manufacturer states that you must enter the PIN: Vgate iCar Pro Bluetooth 4.0 (BLE)

I haven't tested, but I think it's not required.

For the model you suggested, which does not use a PIN, however, I read that you have to press the power button every time and it does not start automatically with the car; is that so? Vgate iCar2 BLE 4.0

I used this this device without any issues, no pin required and it's not required to press the power button on any use. I think you must power on, only on low battery.

Googling a bit I noticed conflicting opinions of users who said that for the same, for some users the PIN was required and for other users not; I discovered that the discriminating thing for many is the operating system of the smartphone, it seems that the pairing for Apple is very often without PIN (I use android)

https://www.amazon.de/dp/B0BG4W6MLD using this since months, without any issues. No pin, no button press is needed. The button is only required to pair the dongle. Switches dongle in visible mode.

[adlerre]

Can I help you with some more attempts?

Not really, because you did everything I would have done.