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--- hardware:majak [2016/02/23 21:33]
admin
+++ hardware:majak [2016/02/23 21:40]
admin
@@ Line 2: / Line 2: @@
 schema je jednoduche
-Client:
+  * Client:
-nagios zavola prikaz "echo "nejaky problem" | netcat 10.0.5.5:6555
+ nagios zavola prikaz "echo "nejaky problem" | netcat 10.0.5.5:6555
-Server s majakem:
+  * Server s majakem:
-inetd posloucha na portu 6555 a spousti skript /home/majak/bin/majak.sh, ktery zapise na /dev/ttyUSB0 prikazy "start_blink" nebo "stop_blink"
+   inetd posloucha na portu 6555 a spousti skript /home/majak/bin/majak.sh, ktery zapise na /dev/ttyUSB0 prikazy "start_blink" nebo "stop_blink"
-Overit funkcnost majaku na strane serveru muzete na dvou kontrolnich mistech
+====== Overit funkcnost majaku ======
+ na strane serveru muzete na dvou kontrolnich mistech
 . zapsat primo na /dev/ttyUSB0
    echo start_blink > /dev/ttyUSB0
@@ Line 37: / Line 38: @@
 root@cerna-ng:/etc/init.d#
 </code>
+====== Konfigurace Inetd.conf ======
+<code>
+    stream  tcp     nowait  majak   /home/majak/bin/majak.sh noarg
+</code>
+====== Poslouchajici skript majak.sh =======
+Musite pridat uzivatele //majak// a napriklad na Debianu ho jeste dat do skupiny 'dialout', protoze jinak nema prava sahat na /dev/ttyUSB0.
+<code bash>
+#!/bin/sh
+if grep -q CRITICAL; then
+        cmd='start_blink'
+else
+        cmd='stop_blink'
+fi
+echo $cmd >/dev/ttyUSB0
+</code>
+Na ''/dev/ttyUSB0'' je pripojene arduino s timto programem
+<code c>
+/*
+  Majacek - Nagios
+ */
+#define  MAX_INPUT_STR  200
+#define  START_BLINK 0
+#define  STOP_BLINK 1
+#define  USER_STOP  2
+String input_str = "";         // a string to hold incoming serial data
+volatile boolean string_complete = false;  // whether the string is complete
+const String cmds[] = {
+  "start_blink",
+  "stop_blink",
+  "user_stop",
+  "",
+  ""};
+int relay = 3;
+int led = 13;
+void setup() {
+  Serial.begin(9600);
+  pinMode(relay, OUTPUT);
+  pinMode(led, OUTPUT);
+  digitalWrite(relay, HIGH);
+  digitalWrite(led, LOW);
+// 3x blikni, at vim, ze jsi ok :)
+  digitalWrite(led, HIGH);
+  delay(400);
+  digitalWrite(led, LOW);
+  delay(200);
+  digitalWrite(led, HIGH);
+  delay(400);
+  digitalWrite(led, LOW);
+  delay(200);
+  digitalWrite(led, HIGH);
+  delay(400);
+  digitalWrite(led, LOW);
+  input_str.reserve(MAX_INPUT_STR);
+//  Serial.println("Initialized.");
+}
+int parse_input(String s) {
+  int i = 0;
+  while (cmds[i] != "") {
+//   Serial.print("Debug parse_input cmd: ");
+//   Serial.println(cmds[i]);
+    if (s == cmds[i])
+       break;
+    i++;
+  }
+  return i;
+}
+void start_blink() {
+   digitalWrite(relay, LOW);
+   digitalWrite(led, HIGH);
+}
+void stop_blink() {
+   digitalWrite(relay, HIGH);
+   digitalWrite(led, LOW);
+}
+void loop() {
+  if (string_complete) {
+//    Serial.println(input_str);
+    int cmd = parse_input(input_str);
+    switch (cmd) {
+      case START_BLINK:
+        start_blink();
+        break;
+      case STOP_BLINK:
+        stop_blink();
+        break;
+      case USER_STOP:
+        stop_blink();
+        break;
+      default:
+//        Serial.print("ERROR: Unknown command: ");
+//        Serial.println(input_str);
+        ;
+    }
+    input_str = "";
+    string_complete = false;
+  }
+}
+/* some debug
+    Serial.print("This is the input char:");
+    int ord = in_char;
+    int enter = '\n';
+    Serial.print(enter);
+    Serial.println(ord);
+*/
+void serialEvent() {
+  while (Serial.available()) {
+    char in_char = (char)Serial.read();
+    if (in_char == '\n')
+      string_complete = true;
+    else
+      input_str += in_char;
+  }
+}
+</code>

hardware/majak.txt · Last modified: 2016/02/28 01:45 by admin