Freematics Forum

Results for PROTO_ISO_9141_2: [UART BEGIN] [UART SEND] ATI [UART RECV] OBD2USART V1.5 ... then this cycle would repeat for the obd.init() [UART SEND] ATZ [UART RECV] ELM327 v1.5 [UART SEND] ATEO [UART RECV] OK [UART SEND] ATHO [UART RECV] OK [UART SEND] ATSP 3 [UART RECV] OK [UART SEND] 010D [UART R...

Could you provide more details on this ‘dedicated chip doing OBD protocols?’ Is this chip’s protocol knowledge something we can edit or is it proprietary? This Freematics device seems to do the hard parts (telecommunication, hub, Traccar integration, etc.) excellently, so I would love to offer up my...

If there's no ELM chip in this device, how does the protocol handshaking even work? I see that that obd.init() includes ELM-style commands such as "AT SP <#>". I trace this through CLink_UART::send, which leads to uart_write_bytes(). I assumed this ESP32 was talking directly to the ECU, bu...