Problem: io.emit after socket.on | ESP8266 & nodejs

[sterngefeuert]

Hi,

thank you very much for providing your library. Everything I'm doing works just fine expect one problem:

I send a JSON every 500ms. I'm receiving the data on my nodejs server but as soon as I want to emit the data instantly it suddenly stops. (it works 4 to 6 times before it freezes).

Arduino:

void sendJSONdata() {
  StaticJsonBuffer<200> jsonBuffer;
  String JSON;
  JsonObject& root = jsonBuffer.createObject();
  root["id"] = sensorId;
  root["name"] = sensorName;
  JsonObject& data = root.createNestedObject("data");
  data.set("timestamp", millis());
  data.set("pleth", ESP8266TrueRandom.random(0, 100));
  data.set("peakToPeak", ESP8266TrueRandom.random(300, 600));
  data.set("bpm", ESP8266TrueRandom.random(80, 120));
  data.set("spo2", ESP8266TrueRandom.random(96, 100));
  root.printTo(JSON);
  Serial.println(JSON);
  client.sendJSON("JSON", JSON);
}

JavaScript

  socket.on('JSON', function (data) {
       var jsonStr = JSON.stringify(data);
       //var parsed = ParseJson(jsonStr);
     io.emit("test", data);
 });

I would be very grateful if you have an idea to this issue. I reached my limits.

[jpeskar]

If you can send several times before it freezes I would suspect a memory overflow. If you don't need the large buffer i would make it smaller.

[washo4evr]

Hi,
it could very well be a memory issue
When you compile / transfer to the ESP, how much flash and RAM is in use?

have you tried increasing the delay from 500 to maybe 5000
how soon does it crash?

[sterngefeuert]

Thank you for your quick response and your ideas. I tried what you mentioned but it could not solve my problem.
For now I found my solution in using websocket rooms.
Overall your library is helping me a lot! :D graze mille.

Am 30.09.2016 um 05:57 schrieb washo4evr <[email protected] mailto:[email protected]>:

Hi,
it could very well be a memory issue
When you compile / transfer to the ESP, how much flash and RAM is in use?

have you tried increasing the delay from 500 to maybe 5000
how soon does it crash?

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[washo4evr]

Hi,
sorry it didnt work but im glad you found a workaround
another question, which exact board are you using?

where are you emitting the data? back to the ESP8266?

[sterngefeuert]

I’m using a WeMos D1 mini. But everything works just fine now.

I’m emitting data from various ESPs to a web application which joins its own room.

From: washo4evr [mailto:[email protected]]
Sent: 08 October 2016 07:51
To: washo4evr/Socket.io-v1.x-Library [email protected]
Cc: psega [email protected]; Author [email protected]
Subject: Re: [washo4evr/Socket.io-v1.x-Library] Problem: io.emit after socket.on | ESP8266 & nodejs (#28)

Hi,
sorry it didnt work but im glad you found a workaround
another question, which exact board are you using?

where are you emitting the data? back to the ESP8266?

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You are receiving this because you authored the thread.
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