I’m working on a project where I’m publishing data up to a custom API and subscribing to the response to update a display on my device. I’m moving away from a mustache based response as it feels really brittle and awkward to add new values in without messing up devices running older firmware. It also doesn’t handle empty values in a way that parses back correctly(If I’m looking for A, B, C, D, if B is NULL, then B will read C instead and everything else will be shifted incorrectly).
For this reason I’m looking to just parse the full JSON response from my API, and trying to use the Jsonparser by @rickkas7.
I seem to be running into an issue due to the multipart response, I’m using the example given but it doesn’t seem to be working for my webhook.
Webhook:
API Response:
Relevant Code:
JsonParser jsonParser; //Global object
Particle.subscribe(System.deviceID() + "/hook-response/er/", temperatureHandler, MY_DEVICES);
void temperatureHandler(const char *event, const char *data) {
int responseIndex = 0;
const char *slashOffset = strchr(event, '/');
if (slashOffset) {
responseIndex = atoi(slashOffset + 1);
Serial.println("offest");
}
Serial.println("rspIndex " + String(responseIndex));
if (responseIndex == 0) {
jsonParser.clear();
}
jsonParser.addString(data);
if (jsonParser.parse()) {
// API resonse complete
parseTempResponse(jsonParser);
}
}
void parseTempResponse(JsonParser &jp){
Serial.println("Webhook response recieved!");
String status, tempStatus, humidityStatus;
float temp, highTemp, lowTemp;
int humidity, highHumidity, lowHumidity;
String rspTime, rspUnit;
int interval = jp.getReference().key("next_reading_interval").valueInt();
jp.getOuterValueByKey("status", status);
jp.getOuterValueByKey("temp_status", tempStatus);
jp.getOuterValueByKey("humidity_status", humidityStatus);
jp.getOuterValueByKey("temp", temp);
jp.getOuterValueByKey("past_high_temp", highTemp);
jp.getOuterValueByKey("past_low_temp", lowTemp);
jp.getOuterValueByKey("humidity", humidity);
jp.getOuterValueByKey("past_high_humidity", highHumidity);
jp.getOuterValueByKey("past_low_humidity", lowHumidity);
jp.getOuterValueByKey("timestamp", rspTime);
jp.getOuterValueByKey("temp_unit", rspUnit);
bool soundWarning = jp.getReference().key("probe").key("sound_warning").valueBool();
bool soundCritical = jp.getReference().key("probe").key("sound_critical").valueBool();
Serial.println("Reported interval: " + String(interval));
Serial.println("Reported status: " + status);
Serial.println("Reported Temp status: " + tempStatus);
Serial.println("Reported Humidity status: " + humidityStatus);
Serial.println("Reported Temp: " + String(temp));
Serial.println("Reported High: " + String(highTemp));
Serial.println("Reported Low: " + String(lowTemp));
Serial.println("Reported Humidity: " + String(humidity));
Serial.println("Reported High: " + String(highHumidity));
Serial.println("Reported Low: " + String(lowHumidity));
Serial.println("Reported Time: " + rspTime);
Serial.println("Reported Unit: " + rspUnit);
Serial.println();
// Processing logic
}
Serial output after publish:
offest
rspIndex 0
offest
rspIndex 0
Webhook response recieved!
Reported interval: 0
Reported status:
Reported Temp status:
Reported Humidity status:
Reported Temp: 0.000000
Reported High: 0.000000
Reported High: 536889288
Reported Low: 0
Reported Time:
Reported Unit:
It looks like the slash offset isn’t being calculated correctly, but I’m not sure why.
I also have an observed that if I use a static JsonParser JsonParserStatic<2048, 100> jsonParser; I don’t get any serial response from parseTempResponse().
