Ardulink 2 unable to receive message from analog Pin1 using Serial.print - arduino-uno

Question

I have started ardulink mqtt to listen to analog pin 1 of the arduino uno
as follow running on windows 10 with mosquitto mqtt broker 1.5.8
C:\Java\jdk1.8.0_201\bin\java -jar ardulink-mqtt-2.1.0.jar -a 1 -connection "ardulink://serial-jssc?port=COM3&pingprobe=false" -standalone
However I could not get any response despite subscribe the topics with home/devices/ardulink/A1/value/get ?
I do not see any publishing being log from the ardulink log or mosquitto
From the Arduino serial monitor , I did see all the output from Serial.print indicating the sketch was in fact fully uploaded to the Arduino uno.
arduino code
int sensorValue;
// variable to calibrate low value
int sensorLow = 1023;
// variable to calibrate high value
int sensorHigh = 0;
void setup() {
Serial.begin(115200);
// calibrate for the first five seconds after program runs
while (millis() < 5000) {
// record the maximum sensor value
sensorValue = analogRead(A1);
if (sensorValue > sensorHigh) {
sensorHigh = sensorValue;
}
// record the minimum sensor value
if (sensorValue < sensorLow) {
sensorLow = sensorValue;
}
}
}
void loop() {
//read the input from A1 and store it in a variable
sensorValue = analogRead(A1);
Serial.print(sensorValue);
// wait for a moment
delay(1000);
}
Ardulink Mqtt log
C:\ardulink\lib>C:\Java\jdk1.8.0_162\bin\java -jar ardulink-mqtt-2.1.0.jar -a 1 -d 13 -connection "ardulink://serial-jss
c?port=COM4&pingprobe=false" -clientId ardulink
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/ardulink/lib/slf4j-jdk14-1.7.12.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/ardulink/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.JDK14LoggerFactory]
Apr 01, 2019 2:44:04 PM org.apache.camel.impl.DefaultCamelContext start
INFO: Apache Camel 2.17.1 (CamelContext: camel-1) is starting
Apr 01, 2019 2:44:04 PM org.apache.camel.management.ManagedManagementStrategy doStart
INFO: JMX is enabled
Apr 01, 2019 2:44:04 PM org.apache.camel.impl.converter.DefaultTypeConverter doStart
INFO: Loaded 182 type converters
Apr 01, 2019 2:44:04 PM org.apache.camel.impl.DefaultRuntimeEndpointRegistry doStart
INFO: Runtime endpoint registry is in extended mode gathering usage statistics of all incoming and outgoing endpoints (c
ache limit: 1000)
Apr 01, 2019 2:44:14 PM org.ardulink.core.ConnectionBasedLink startListening
INFO: Starting listening on pin ANALOG 1
Apr 01, 2019 2:44:14 PM org.ardulink.core.ConnectionBasedLink startListening
INFO: Starting listening on pin DIGITAL 13
Apr 01, 2019 2:44:14 PM org.apache.camel.impl.DefaultComponent preProcessUri
WARNING: Supplied URI 'mqtt:mqttMain?host=tcp://localhost:1883&subscribeTopicNames=home/devices/ardulink/#&connectAttemp
tsMax=1&reconnectAttemptsMax=0' contains unsafe characters, please check encoding
Apr 01, 2019 2:44:15 PM org.apache.camel.impl.DefaultCamelContext doStartCamel
INFO: AllowUseOriginalMessage is enabled. If access to the original message is not needed, then its recommended to turn
this option off as it may improve performance.
Apr 01, 2019 2:44:15 PM org.apache.camel.impl.DefaultCamelContext doStartCamel
INFO: StreamCaching is not in use. If using streams then its recommended to enable stream caching. See more details at h
ttp://camel.apache.org/stream-caching.html
Apr 01, 2019 2:44:15 PM org.apache.camel.processor.aggregate.AggregateProcessor doStart
INFO: Defaulting to MemoryAggregationRepository
Apr 01, 2019 2:44:15 PM org.apache.camel.processor.aggregate.AggregateProcessor doStart
INFO: Using CompletionInterval to run every 250 millis.
Apr 01, 2019 2:44:15 PM org.apache.camel.component.mqtt.MQTTEndpoint connect
INFO: Connecting to tcp://localhost:1883 using 10 seconds timeout
Apr 01, 2019 2:44:15 PM org.apache.camel.component.mqtt.MQTTEndpoint$2 onConnected
INFO: MQTT Connection connected to tcp://localhost:1883
Apr 01, 2019 2:44:15 PM org.apache.camel.impl.DefaultCamelContext doStartOrResumeRouteConsumers
INFO: Route: route1 started and consuming from: Endpoint[ardulink://serial-jssc?listenTo=A1%2CD13&pingprobe=false&port=C
OM4]
Apr 01, 2019 2:44:15 PM org.apache.camel.impl.DefaultCamelContext doStartOrResumeRouteConsumers
INFO: Route: route2 started and consuming from: Endpoint[direct://endOfAnalogAggregation]
Apr 01, 2019 2:44:15 PM org.apache.camel.impl.DefaultCamelContext doStartOrResumeRouteConsumers
INFO: Route: route3 started and consuming from: Endpoint[mqtt:mqttMain?host=tcp://localhost:1883&subscribeTopicNames=hom
e/devices/ardulink/#&connectAttemptsMax=1&reconnectAttemptsMax=0]
Apr 01, 2019 2:44:15 PM org.apache.camel.impl.DefaultCamelContext start
INFO: Total 3 routes, of which 3 are started.
Apr 01, 2019 2:44:15 PM org.apache.camel.impl.DefaultCamelContext start
INFO: Apache Camel 2.17.1 (CamelContext: camel-1) started in 10.898 seconds

Answer 1

It seems that you did not flash Ardulink sketch to the Arduino but something self-written (which does not send any message via the serial link). After flashing Ardulink sketch and starting java mqtt client again everything should work.

Answer 2

I managed to resolve the issue after including the standard ardulink protocol , below is the revised arduino code .
int sensorValue;
// variable to calibrate low value
int sensorLow = 1023;
// variable to calibrate high value
int sensorHigh = 0;
// LED pin
const int ledPin = 13;
String inputString = ""; // a string to hold incoming data (this is general code you can reuse)
boolean stringComplete = false; // whether the string is complete (this is general code you can reuse)
void setup() {
// Make the LED pin an output and turn it on
Serial.begin(115200);
Serial.print("alp://rply/");
Serial.print("ok?id=0");
Serial.print('\n'); // End of Message
Serial.flush();
pinMode(ledPin, OUTPUT);
digitalWrite(ledPin, HIGH);
// calibrate for the first five seconds after program runs
while (millis() < 5000) {
// record the maximum sensor value
sensorValue = analogRead(A1);
if (sensorValue > sensorHigh) {
sensorHigh = sensorValue;
}
// record the minimum sensor value
if (sensorValue < sensorLow) {
sensorLow = sensorValue;
}
}
digitalWrite(ledPin, LOW);
}
void loop() {
//read the input from A1 and store it in a variable
serialEvent();
sensorValue = analogRead(A1);
if (stringComplete==true){
if(inputString.startsWith("alp://")) {
boolean msgRecognized = true;
if (inputString.substring(6,10)=="ared"){
//Serial.println(sensorValue);
digitalWrite(ledPin, HIGH);
}else{
msgRecognized = false;
}
// Prepare reply message if caller supply a message id (this is general code you can reuse)
int idPosition = inputString.indexOf("?id=");
if(idPosition != -1) {
String id = inputString.substring(idPosition + 4);
// print the reply
Serial.print("alp://rply/");
if(msgRecognized) { // this sketch doesn't know other messages in this case command is ko (not ok)
Serial.print("ok?id=");
} else {
Serial.print("ko?id=");
}
Serial.print(id);
Serial.print('\n'); // End of Message
Serial.flush();
}
}
// clear the string:
inputString = "";
stringComplete = false;
}
if (sensorValue>0){
Serial.print("alp://ared/");
Serial.print("1");
Serial.print("/");
Serial.print(sensorValue);
Serial.print('\n'); // End of Message
Serial.flush();
}
delay(1000);
}
void serialEvent() {
while (Serial.available()>0&&!stringComplete==true) {
// get the new byte:
char inChar = (char)Serial.read();
// add it to the inputString:
inputString += inChar;
// if the incoming character is a newline, set a flag
// so the main loop can do something about it:
if (inChar == '\n') {
stringComplete = true;
}
}
}