What BLE characteristic should I use in a BLE IOS device for OBDII

user_1082824 0
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Hello I am wondering what write and notify characteristic I should use from this OBDII BLE device/Dongle?: I want to create a program for IOS in Flutter. There are quite a few

 : Device name: VEEPEAK Device id: 34E2B2AF-60F4-9362-DBF6-AD750321AABA
Number of discovered Services: 3
Service Service: UUID: 0000180a-0000-1000-8000-00805f9b34fb
  Charac.: UUID: 00002a29-0000-1000-8000-00805f9b34fb
     Can read: true Can write: false  Can notify: false
  Charac.: UUID: 00002a24-0000-1000-8000-00805f9b34fb
    Can read: true Can write: false  Can notify: false
 Charac.: UUID: 00002a25-0000-1000-8000-00805f9b34fb
   Can read: true Can write: false  Can notify: false
 Charac.: UUID: 00002a27-0000-1000-8000-00805f9b34fb
    Can read: true Can write: false  Can notify: false
 Charac.: UUID: 00002a26-0000-1000-8000-00805f9b34fb
    Can read: true Can write: false  Can notify: false
 Charac.: UUID: 00002a28-0000-1000-8000-00805f9b34fb
   Can read: true Can write: false  Can notify: false
 Charac.: UUID: 00002a23-0000-1000-8000-00805f9b34fb
   Can read: true Can write: false  Can notify: false
 Charac.: UUID: 00002a2a-0000-1000-8000-00805f9b34fb
   Can read: true Can write: false  Can notify: false

Service Service: UUID: 49535343-fe7d-4ae5-8fa9-9fafd205e455
  Charac.: UUID: 49535343-6daa-4d02-abf6-19569aca69fe
    Can read: true Can write: true  Can notify: false
  Charac.: UUID: 49535343-aca3-481c-91ec-d85e28a60318
    Can read: false Can write: true  Can notify: true

Service Service: UUID: 0000fff0-0000-1000-8000-00805f9b34fb
  Charac.: UUID: 0000fff1-0000-1000-8000-00805f9b34fb
    Can read: false Can write: false  Can notify: true
  Charac.: UUID: 0000fff2-0000-1000-8000-00805f9b34fb
    Can read: false Can write: true  Can notify: false
obd-ii bluetooth-lowenergy ios
1 Answers

The characteristic, in this case, are those for a UART communication:

Service Service: UUID: 0000fff0-0000-1000-8000-00805f9b34fb

use the notify of this one...
  Charac.: UUID: 0000fff1-0000-1000-8000-00805f9b34fb
    Can read: false Can write: false  Can notify: true
  Charac.: UUID: 0000fff2-0000-1000-8000-00805f9b34fb

use the write of this one...
    Can read: false Can write: true  Can notify: false

There is not really a rule to it but u can use a tool on Android or IOS called nRF Connect and you can send and receive from characteristics to try them out. The OBD dongles are quite similar. In fact, many Chinese dongles use exactly the same characteristics (same firmware?). I can confirm that for Carista and VeePeak.

user_10828240
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