repo: add kconfig build configuration

main/Kconfig.projbuild

+menu "LEGOS"
+
+    choice
+        prompt "Target"
+        default TEST
+
+        comment "Distribution grid"
+        config BRANCH
+            bool "Branch"
+            if BRANCH
+                config ENTITY
+                    string
+                    default "branch"
+            endif
+        config SUBSTATION
+            bool "Substation"
+            if SUBSTATION
+                config ENTITY
+                    string
+                    default "substation"
+            endif
+
+        comment "Consumers"
+        config DATACENTER
+            bool "Data center"
+            if DATACENTER
+                config ENTITY
+                    string
+                    default "data_center"
+            endif
+        config ECSTATION
+            bool "EC station"
+            if ECSTATION
+                config ENTITY
+                    string
+                    default "ec_station"
+            endif
+        config FACTORY
+            bool "Factory"
+            if FACTORY
+                config ENTITY
+                    string
+                    default "factory"
+            endif
+        config HOSPITAL
+            bool "Hospital"
+            if HOSPITAL
+                config ENTITY
+                    string
+                    default "hospital"
+            endif
+        config SKYSCRAPER
+            bool "Skyscraper"
+            if SKYSCRAPER
+                config ENTITY
+                    string
+                    default "skyscraper"
+            endif
+        config STADIUM
+            bool "Stadium"
+            if STADIUM
+                config ENTITY
+                    string
+                    default "stadium"
+            endif
+
+        comment "Prosumers"
+        config HOUSE
+            bool "House"
+            if HOUSE
+                config ENTITY
+                    string
+                    default "house"
+            endif
+        config SUPERMARKET
+            bool "Supermarket"
+            if SUPERMARKET
+                config ENTITY
+                    string
+                    default "supermarket"
+            endif
+
+        comment "Producers"
+        config POWERPLANT
+            bool "Power plant"
+            if POWERPLANT
+                config ENTITY
+                    string
+                    default "power_plant"
+            endif
+        config SOLARFARM
+            bool "Solar farm"
+            if SOLARFARM
+                config ENTITY
+                    string
+                    default "solar_farm"
+            endif
+        config WINDFARM
+            bool "Wind farm"
+            if WINDFARM
+                config ENTITY
+                    string
+                    default "wind_farm"
+            endif
+
+        config TEST
+            bool "Test"
+            if TEST
+                config ENTITY
+                    string
+                    default "test"
+            endif
+    endchoice
+
+    
+
+    menu "WiFi"
+        config WIFI_STA_SSID
+            string "WiFi SSID"
+            default "FRITZ!Box 7530 TW"
+            help
+                SSID (network name) for LEGOS entity to connect to.
+
+        config WIFI_STA_PASS
+            string "WiFi PASS"
+            default "31361912602018850594"
+            help
+                Password for WiFi network.
+    endmenu
+
+    menu "MQTT"
+        config MQTT_USER
+            string "Username"
+            default "roger"
+            help
+                Broker username.
+
+        config MQTT_PASS
+            string "Password"
+            default "password"
+            help
+                Broker password.
+
+        config MQTT_HOST
+            string "Host name or IP address"
+            default "192.168.1.1"
+            help
+                Broker address.
+
+        config MQTT_PORT
+            int "Port"
+            default 1883
+            help
+                Broker port.
+
+        config MQTT_RATE
+            int "Reporting rate"
+            default 1
+            help
+                Reporting rate (Hz).
+        
+        choice
+            prompt "QoS level"
+            default MQTT_QOS_LEVEL_0
+
+            config MQTT_QOS_LEVEL_0
+                bool "At most once (0)"
+                if MQTT_QOS_LEVEL_0
+                    config MQTT_QOS_LEVEL
+                        int
+                        default 0
+                endif
+            config MQTT_QOS_LEVEL_1
+                bool "At least once (1)"
+                if MQTT_QOS_LEVEL_1
+                    config MQTT_QOS_LEVEL
+                        int
+                        default 1
+                endif
+            config MQTT_QOS_LEVEL_2
+                bool "Exactly once (2)"
+                if MQTT_QOS_LEVEL_2
+                    config MQTT_QOS_LEVEL
+                        int
+                        default 2
+                endif
+        endchoice
+
+        choice
+            prompt "Transport"
+            default MQTT_TRANSPORT_OVER_TCP
+
+            config MQTT_TRANSPORT_OVER_TCP
+                bool "TCP"
+                if MQTT_TRANSPORT_OVER_TCP
+                    config MQTT_TRANSPORT
+                        int
+                        default 1
+                endif
+            config MQTT_TRANSPORT_OVER_SSL
+                bool "SSL"
+                if MQTT_TRANSPORT_OVER_SSL
+                    config MQTT_TRANSPORT
+                        int
+                        default 2
+                endif
+        endchoice
+    endmenu
+endmenu