[Ovmsdev] New to OVMS development

[Mark Webb-Johnson]

Christian,

Welcome aboard.

Congratulations getting it working on the Lilygo. I like their products (particularly those with the little OLED displays).

Regarding the cellular code, when you say TCP/IP (not PPP) do you mean that you are using the TCP/IP stack on the modem, and not the IP stack on the ESP32? Using AT+CIPSTART? That is how we used to do it in OVMS v2, but that was because the PIC processor had no IP stack and resources were very tight. I am not sure that nowadays that is the correct approach. What about protocols like mDNS, our web server, etc? All would have to treat Wifi differently to Cellular.

Regards, Mark.

> On 24 Jan 2025, at 3:44 AM, Michael Balzer via OvmsDev <ovmsdev at lists.openvehicles.com> wrote:
> 
> Signed PGP part
> Christian, welcome :-)
> 
> no idea if we need PPP for additional error detection, as we cannot use hardware flow control between the ESP32 and the modem on the OVMS board, or if direct TCP/IP would actually perform better due to less packet overhead. Mark can better comment on this.
> 
> Nevertheless, the addition of support for the SIMCOM 7670 certainly would be valuable, and support for a different hardware base is also quite interesting.
> 
> Regarding additions to the Smart EQ adapter, please submit these as separate pull requests -- I assume they can be merged right away without taking your low level mods into account.
> 
> If not yet done, consider contacting the Smart maintainer Thomas Heuer (@Dimitrie78 on github, also present here on the list) to coordinate your efforts.
> 
> Regards,
> Michael
> 
> 
> Am 23.01.25 um 12:29 schrieb Info Zeitnitz via OvmsDev:
>> Hi everyone,
>> my name is Christian and I started some time ago to adapt the OVMS firmware to my hardware.
>> 
>> The hardware is a Lilygo T-Call A7670E V1.0 board (ESP32 Wrover-E, 4G modem Simcom 7670E, 4MB Flash, 8MB PSRAM) mounted on a custom PCB providing power, two CAN bus transceivers  and 1 MCP2515. No extension chip is implemented.
>> 
>> I use this to connect to my Smart EQ, which actually needs only a single CAN bus.
>> 
>> I got the firmware going, including the 4G modem and its running reasonably stable, even though the Lilygo board has only 4MB of Flash (had to disable OTA and some other components). It works with both server versions.
>> This firmware is based on the Version 3.3-004 tagged in the Github repo. I had to modify the code to get it working without the extension and with the Simcom 7670 module. In addition I added some changes from the master branch, especially for the Smart EQ.
>> 
>> I would be willing to share some of the mods I did to the code and contribute to the further development.
>> Especially the cellular code, which is still utilizing PPP, could benefit from an update to TCP/IP. I actually had quite a hard time to get the modem going with PPP, since the Simcom 7670 does not understand all the used AT-commands.
>> 
>> So, I hope for a productive collaboration.
>> 
>> Best regards
>>    Christian
>> 
>> 
>> _______________________________________________
>> OvmsDev mailing list
>> OvmsDev at lists.openvehicles.com <mailto:OvmsDev at lists.openvehicles.com>
>> http://lists.openvehicles.com/mailman/listinfo/ovmsdev
> 
> -- 
> Michael Balzer * Am Rahmen 5 * D-58313 Herdecke
> Fon 02330 9104094 * Handy 0176 20698926
> 
> _______________________________________________
> OvmsDev mailing list
> OvmsDev at lists.openvehicles.com <mailto:OvmsDev at lists.openvehicles.com>
> http://lists.openvehicles.com/mailman/listinfo/ovmsdev

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openvehicles.com/pipermail/ovmsdev/attachments/20250124/e42028ce/attachment-0001.htm>