susbsys/mgmt/mcumgr/grp: add role field to parameters response

Added optional `inst_role` field to MCUmgr Parameters response.
Field is intended to express MCUmgr instance role of the device.
Interpretation of the value is Application specific.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>

Author: nvlsianpu

subsys/mgmt/mcumgr/grp/os_mgmt/Kconfig

@@ -166,6 +166,17 @@ config MCUMGR_GRP_OS_DATETIME_HOOK
 config MCUMGR_GRP_OS_MCUMGR_PARAMS
 	bool "MCUMGR Parameters retrieval command"
 
+config MCUMGR_GRP_OS_MCUMGR_PARAMS_ROLE
+	bool "MCUMGR Parameter Role in response"
+	depends on MCUMGR_GRP_OS_MCUMGR_PARAMS
+
+config MCUMGR_GRP_OS_MCUMGR_PARAMS_ROLE_VALUE
+	int "MCUMGR Parameter Role value"
+	default 0
+	depends on MCUMGR_GRP_OS_MCUMGR_PARAMS_ROLE
+	helps
+	  Value for `inst_role` field in response to MCUmgr Parameters request.
+
 config MCUMGR_GRP_OS_INFO
 	bool "Support for info command"
 	help

subsys/mgmt/mcumgr/grp/os_mgmt/src/os_mgmt.c

@@ -472,6 +472,10 @@ os_mgmt_mcumgr_params(struct smp_streamer *ctxt)
 	     zcbor_uint32_put(zse, CONFIG_MCUMGR_TRANSPORT_NETBUF_SIZE)	&&
 	     zcbor_tstr_put_lit(zse, "buf_count")		&&
 	     zcbor_uint32_put(zse, CONFIG_MCUMGR_TRANSPORT_NETBUF_COUNT);
+#ifdef CONFIG_MCUMGR_GRP_OS_MCUMGR_PARAMS_ROLE
+	     zcbor_tstr_put_lit(zse, "inst_role")		&&
+	     zcbor_uint32_put(zse, CONFIG_MCUMGR_GRP_OS_MCUMGR_PARAMS_ROLE_VALUE);
+#endif
 
 	return ok ? MGMT_ERR_EOK : MGMT_ERR_EMSGSIZE;
 }