[RSDK-12691] NO_MODULE_PARENT

[njooma]

Allow the module to start without a module parent so that viam can detect modules without spinning up an RDK instance

[lia-viam]

this seems to be fine except for a linter warning in the build, you may be able to mark it with a // NOLINT(name-of-warning) comment

[lia-viam]

lgtm, wondering if this is currently possible for us to validate with manual testing though?

[njooma]

@lia-viam i did validate with manual testing!

> viam module update-models --binary /Users/naveed/Developer/viam-cpp-sdk/build/src/viam/examples/modules/simple/simple_module --module meta.json

2025-11-25T19:36:59.051Z	INFO	x.modmanager.xxxx	modmanager/manager.go:268	Now adding module	{"module":"xxxx"}
2025-11-25T19:36:59.055Z	INFO	x.modmanager.xxxx	modmanager/module.go:294	Starting up module	{"module":"xxxx","tcp_mode":false}
2025-11-25T19:36:59.055Z	INFO	x.modmanager.xxxx	utils/env.go:179	Starting module with following Viam environment variables	{"environment":["VIAM_NO_MODULE_PARENT=true","VIAM_HOME=","VIAM_MODULE_DATA=","VIAM_MODULE_NAME=xxxx"]}
2025-11-25T19:36:59.428Z	INFO	x.modmanager.xxxx.StdOut	pexec/managed_process.go:444	
\_ 2025--11--25 13:36:59: [Viam C++ SDK] <info> [simple/main.cpp:87] Starting up simple sensor module
2025-11-25T19:36:59.434Z	INFO	x.modmanager.xxxx.StdOut	pexec/managed_process.go:444	
\_ 2025--11--25 13:36:59: [Viam C++ SDK] <info> [module/service.cpp:311] Module listening on /var/folders/kb/_9lx_66d2gjg_hydb9xp91z40000gn/T/viam-cli-test-2474802933/xxxx-ftGlv.sock
2025-11-25T19:36:59.435Z	INFO	x.modmanager.xxxx.StdOut	pexec/managed_process.go:444	
\_ 2025--11--25 13:36:59: [Viam C++ SDK] <info> [module/service.cpp:312] Module handles the following API/model pairs:
2025-11-25T19:36:59.435Z	INFO	x.modmanager.xxxx.StdOut	pexec/managed_process.go:444	
\_ API: rdk:component:sensor
2025-11-25T19:36:59.435Z	INFO	x.modmanager.xxxx.StdOut	pexec/managed_process.go:444	
\_ 	Model: viam:sensor:mysensor
2025-11-25T19:36:59.463Z	INFO	x.modmanager.xxxx	modmanager/module.go:116	Waiting for module to respond to ready request	{"module":"xxxx"}
2025-11-25T19:36:59.470Z	WARN	x.modmanager.xxxx	modmanager/module.go:181	Unable to create PeerConnection with module. Ignoring.	{"err":"unexpected end of JSON input"}
2025-11-25T19:36:59.473Z	INFO	x.modmanager.xxxx	modmanager/module.go:389	Registering component API and model from module	{"module":"xxxx","API":"rdk:component:sensor","model":"viam:sensor:mysensor"}
2025-11-25T19:36:59.473Z	INFO	x.modmanager.xxxx	modmanager/manager.go:389	Module successfully added	{"module":"xxxx"}
2025-11-25T19:36:59.473Z	INFO	x.modmanager	modmanager/manager.go:285	Modules successfully added	{"modules":["xxxx"]}
2025-11-25T19:36:59.473Z	INFO	x.modmanager.xxxx	modmanager/module.go:335	Stopping module: xxxx process
2025-11-25T19:36:59.473Z	INFO	x.modmanager.xxxx.xxxx	pexec/managed_process_unix.go:100	stopping process 70356 with signal terminated
2025-11-25T19:36:59.473Z	INFO	x.modmanager.xxxx.StdOut	pexec/managed_process.go:444	
\_ 2025--11--25 13:36:59: [Viam C++ SDK] <info> [module/service.cpp:292] Shutting down gracefully.
2025-11-25T19:36:59.477Z	INFO	x.modmanager.xxxx	modmanager/manager.go:523	Module successfully closed	{"module":"xxxx"}