Added lab for universal API server and client testing

Signed-off-by: pipeacosta <pipeacosta@gmail.com>

etc/labs/lab18_rest_api/docker-compose.yml

@@ -0,0 +1,27 @@
+version: '3.1'
+
+services:
+  node1:
+    container_name: villas_1
+    # The following image is build from the VILLASnode Github repository, branch rest-api-lab, see: 
+    image: node:config-mvp
+    ports: 
+      - "8080:8080/tcp"
+      - "4445:4445/udp"
+    volumes:
+      - ./lab18_rest_api_ri1.conf:/etc/node/lab18_rest_api_ri1.conf
+    command:
+      - node
+      - /etc/node/lab18_rest_api_ri1.conf
+
+  # node2:
+  #   container_name: villas_2
+  #   image: node:config-mvp
+  #   ports: 
+  #     - "8080:8080/tcp"
+  #     - "4446:4446/udp"
+  #   volumes:
+  #     - ./node_ri2.conf:/etc/node/node_ri2.conf
+  #   command:
+  #     - node
+  #     - /etc/node/node_ri2.conf

etc/labs/lab18_rest_api/lab18_rest_api_ri1.conf

@@ -0,0 +1,108 @@
+http = {
+	port = 8080
+}
+
+nodes = {
+	node_ri1_api = {
+		type = "api"
+
+		in = {
+			signals = (
+				{
+					name = "ri2-amp-p",
+					type = "float",
+					unit = "mW",
+					description = "Active power",
+					rate = 1,
+					readable = true,
+					writable = false,
+					payload = "samples"
+				},
+				{
+					name = "ri2-amp-q",
+					type = "float",
+					unit = "pu",
+					description = "Reactive power",
+					rate = 1,
+					readable = true,
+					writable = false,
+					payload = "samples"
+				}
+			)
+		}
+
+		out = {
+			signals = (
+				# Output signals have no name, type and unit settings as those are implicitly
+				# derived from the signals which are routed to this node
+				{
+					description = "Frequency",
+					rate = 1,
+					readable = true,
+					writable = false,
+					payload = "samples"
+				},
+				{
+					description = "Voltage",
+					rate = 1,
+					readable = true,
+					writable = false,
+					payload = "samples"
+				}
+			)
+		}
+	},
+
+	node_ri1_rtds = {
+		type = "signal.v2"
+		rate = 1.0
+		# signal = "mixed"
+
+		in = {
+			signals = (
+				{ name = "ri1-rtds-f", signal = "constant", amplitude = 1.0, enabled = true },
+				{ name = "ri1-rtds-u", signal = "constant", amplitude = 2.0, enabled = true }
+			)
+		}
+        },
+
+	loopback_node = {
+		type = "loopback",
+		queuelen = 1024
+    	}
+
+	# node_ri1_rtds = {
+	# 	type = "socket",
+	# 	format = "gtnet",
+
+	# 	in = {
+	# 		address = "*:4445",
+	# 		signals = (
+	# 			{ name = "ri1-rtds-f", type = "float", enabled = true},
+	# 			{ name = "ri1-rtds-u", type = "float", enabled = true}
+	# 		)
+	# 	},
+	# 	out = {
+	# 		address = "134.130.169.107:4446"
+	# 	}
+	# }
+}
+
+paths = (
+	{
+		in = [
+			"node_ri1_api"
+		]
+		out = [
+			"loopback_node"
+		]
+	},
+	{
+		in = [
+			"node_ri1_rtds"
+		]
+		out = [
+			"node_ri1_api"
+		]
+	}
+)

etc/labs/lab18_rest_api/lab18_rest_api_ri2.conf

@@ -0,0 +1,102 @@
+nodes = {
+	node_ri2_client = {
+		type = "api-client",
+		
+		# The HTTP REST API endpoint of the uAPI server
+		endpoint = "http://137.226.133.196:8080/api/v2/universal/node_ri1_api",
+
+		rate = 1				# Rate at which we poll the broker for updates
+		timeout = 0.5,				# Timeout of HTTP request in seconds (default is 1, must be smaller than 1 / rate)
+		verify_ssl = false,			# Verification of SSL server certificates (default is true)
+
+		in = {
+			signals = (
+				{
+					name = "ri1-rtds-f",
+					type = "float",
+					unit = "Hz",
+					description = "Frequency",
+					rate = 1,
+					readable = true,
+					writable = false,
+					payload = "samples"
+				},
+				{
+					name = "ri1-rtds-u",
+					type = "float",
+					unit = "kV",
+					description = "Voltage",
+					rate = 1,
+					readable = true,
+					writable = false,
+					payload = "samples"
+				}
+			)
+		},
+
+		out = {
+			signals = (
+				# Output signals have no name, type and unit settings as those are implicitly
+				# derived from the signals which are routed to this node
+				{
+					description = "Active power",
+					rate = 1,
+					readable = true,
+					writable = false,
+					payload = "samples"
+				},
+				{
+					description = "Reactive power",
+					rate = 1,
+					readable = true,
+					writable = false,
+					payload = "samples"
+				}
+			)
+		}
+	},
+
+	node_ri2_amp = {
+		type = "socket",
+		layer = "udp",
+
+		format = {
+			type = "json",
+			compact = true
+		},
+		
+		in = {
+			address = "*:4446",
+			signals = (
+				{ name = "ri2-amp-p", type = "float", enabled = true},
+				{ name = "ri2-amp-q", type = "float", enabled = true}
+			)
+		},
+		
+		out = {
+			address = "137.226.133.196:4445"
+		}
+	}
+}
+
+paths = (
+	{
+		in = [
+			"node_ri2_client"
+		]
+		out = [
+			"node_ri2_amp"
+		]
+	},
+	{
+		in = [
+			"node_ri2_amp"
+		]
+		out = [
+			"node_ri2_client"
+		],
+                hooks = (
+                        { type = "print" }
+                )
+	}
+)