[Ovmsdev] Refactoring MODEM/SIMCOM for v3.3

[Mark Webb-Johnson]

The initial implementation of this work is in branch for-v3.3, in GitHub. That branch can be used for the upcoming 3.3 release, including potentially breaking changes.

I’d appreciate any feedback. For the SIM5360, the behaviour should be unchanged from the current implementation (except some improvements to edge cases and control logic). The major user visible change is from ’simcom’ to ‘modem’ for the console commands.

Regards, Mark.

> On 20 Aug 2020, at 9:35 PM, Mark Webb-Johnson <mark at webb-johnson.net> wrote:
> 
> 
> I have started the work on refactoring the modem driver to support virtual driver implementations (SIMCOM 5360 being just one of them). This is a major refactoring that will take some time to complete. It is likely that the following components/files will be affected:
> 
> Component simcom (major changes)
> New component ovms_modem introduced
> ovms_webserver/dev/commands.htm
> ovms_webserver/src/web_cfg_init.cpp
> ovms_webserver/src/web_cfg.cpp
> Component powermgmt
> And several other components mentioning Simcom, but only very minor changes
> 
> I would appreciate it if no major changes were made to those components in the next week or two, as that may make merging difficult.
> 
> Once I’ve got the modem code refactored, and a compatible SIMCOM 5360 driver working, I’ll publish to the for-v3.3 branch for wider testing. I can then add the other modem drivers I have been working on.
> 
> Regards, Mark.
> 
> P.S. Pretty obvious that this work is to abstract out the modem type specific code, to make it easier to add support for other modem types in OVMS. This is a long-term project, and not something happening anytime soon, but I am working on it.
> 
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