New sample telnet driver

public/Send Telnet Command.groovy

+/*
+   A simple driver that will run a command via telnet
+   Useful with Rpi's
+
+   Copyright 2019 Sha'ul ben Yeshua / Scott Grayban
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+*/
+
+metadata {
+	definition (name: "Send Telnet Command", namespace: "sgrayban", author: "Scott Grayban")
+    {        
+        capability "Initialize"
+        capability "Telnet"
+        capability "Switch"
+        
+        command "Reboot Device"
+	}
+	
+	attribute "Telnet", "String"
+
+	preferences {
+		input "ip", "text", title: "Target System IP", description: "", required: true, displayDuringSetup: true
+		input "port", "text", title: "Target System Telnet Port", description: "", required: true, displayDuringSetup: true
+		input "username", "text", title: "Username", description: "", required: true, displayDuringSetup: true
+		input "password", "text", title: "Password", description: "", required: true, displayDuringSetup: true
+        input name: "logEnable", type: "bool", title: "Enable debug logging", defaultValue: true
+    }
+}
+
+def initialize(){
+    log.debug "Connecting to telnet - IP = ${ip}, Port = ${port.toInteger()}, Username = ${username}, Password = ${password}"
+    telnetConnect([terminalType: 'VT100'], ip, port.toInteger(), username, password)
+}
+
+def installed(){
+    log.info "Installed"
+    log.info "Please enter your login credentials."
+}
+
+def updated(){
+    log.info "Preferences updated"
+}
+
+def on() {
+    initialize()
+	if (logEnable) log.info "Send Reboot"
+	sendEvent(name: "switch", value: "on")
+    def msg = "sudo reboot"
+    if (logEnable) log.info "Sending msg = ${msg}"
+	sendHubCommand(new hubitat.device.HubAction("""$msg\r\n""", hubitat.device.Protocol.TELNET))
+    runIn(2,sendEvent(name: "switch", value: "off"))
+}
+def reboot(){
+    on()
+}
+
+def parse(String msg) {
+    if (logEnable) log.debug "Telnet Response = ${msg}"
+    if (msg == "permitted by applicable law.") {
+        sendEvent(name: "Telnet", value: "Connected");
+    }
+}
+
+def telnetStatus(String status){
+	if (logEnable) log.info "telnetStatus- error: ${status}"
+	if (status == "receive error: Stream is closed"){
+		
+		if (logEnable) log.error "Telnet connection dropped..."
+        sendEvent(name: "Telnet", value: "Disconnected")
+		initialize()
+	} else {
+		sendEvent(name: "Telnet", value: "Connected")
+	}
+}