Basic RS232 Communication (#780)

* Added ZGateway RS232
2020-10-19 13:48:58 -05:00
1 parent 546b27773f
commit 3df16d2d52
@@ -0,0 +1,87 @@
+/*  
+  OpenMQTTGateway  - ESP8266 or Arduino program for home automation 
+
+   Act as a wifi or ethernet gateway between your RS232 device and a MQTT broker 
+   Send and receiving command by MQTT
+ 
+  This gateway enables to:
+ - receive MQTT data from a topic and send RS232 signal corresponding to the received MQTT data
+ - publish MQTT data to a different topic related to received RS232 signal
+
+    Copyright: (c)Florian ROBERT
+  
+    This file is part of OpenMQTTGateway.
+    
+    OpenMQTTGateway is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    OpenMQTTGateway is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "User_config.h"
+
+#ifdef ZgatewayRS232
+
+#  include <SoftwareSerial.h>
+
+SoftwareSerial RS232Serial(RS232_RX_GPIO, RS232_TX_GPIO); // RX, TX
+
+void setupRS232() {
+  // define pin modes for RX, TX:
+  pinMode(RS232_RX_GPIO, INPUT);
+  pinMode(RS232_TX_GPIO, OUTPUT);
+  // set the data rate for the SoftwareSerial port
+  RS232Serial.begin(RS232Baud);
+
+  Log.notice(F("RS232_RX_GPIO: %d " CR), RS232_RX_GPIO);
+  Log.notice(F("RS232_TX_GPIO: %d " CR), RS232_TX_GPIO);
+  Log.notice(F("RS232Baud: %d " CR), RS232Baud);
+  Log.trace(F("ZgatewayRS232 setup done " CR));
+}
+
+void RS232toMQTT() {
+  //This function is Blocking, but there should only ever be a few bytes, usually an ACK or a NACK.
+  if (RS232Serial.available()) {
+    Log.trace(F("RS232toMQTT" CR));
+    static char RS232data[MAX_INPUT];
+    static unsigned int input_pos = 0;
+    static char inChar;
+    do {
+      if (RS232Serial.available()) {
+        inChar = RS232Serial.read();
+        RS232data[input_pos] = inChar;
+        input_pos++;
+        Log.trace(F("Received %c" CR), inChar);
+      }
+    } while (inChar != RS232InPost && input_pos < MAX_INPUT);
+    RS232data[input_pos] = 0;
+    input_pos = 0;
+    Log.trace(F("Publish %s" CR), RS232data);
+    char* output = RS232data + sizeof(RS232Pre) - 1;
+    pub(subjectRS232toMQTT, output);
+  }
+}
+
+void MQTTtoRS232(char* topicOri, JsonObject& RS232data) {
+  Log.trace(F("json" CR));
+  if (cmpToMainTopic(topicOri, subjectMQTTtoRS232)) {
+    Log.trace(F("MQTTtoRS232 json" CR));
+    const char* data = RS232data["value"];
+    const char* prefix = RS232data["prefix"] | RS232Pre;
+    const char* postfix = RS232data["postfix"] | RS232Post;
+    Log.trace(F("Value set: %s" CR), data);
+    Log.trace(F("Prefix set: %s" CR), prefix);
+    Log.trace(F("Postfix set: %s" CR), postfix);
+    RS232Serial.print(prefix);
+    RS232Serial.print(data);
+    RS232Serial.print(postfix);
+  }
+}
+#endif