pico + WIZ550io + mqtt connection issue

[espruino-discuss2]

Posted at 2018-07-22 by d0773d

I've been attempting to connect to mqtt using the WIZ550io instead of wifi without success. My goal is to use a pico + WIZ550io + mqtt to trigger relays. I doubled checked if my pico has an IP address by typing eth.getIP() into the IDE console and I get the following result:

={
  "ip": "192.168.0.21",
  "subnet": "255.255.255.0",
  "gateway": "192.168.0.1",
  "dns": "************",
  "mac": "00:08:dc:1e:b9:73"
 }

I'm following this guide: http://www.espruino.com/Home+Automation

I think my issue is with in my onInit function. I'm trying to call mqttConnect(); on a successful

eth.getIP

, but I don't think

mqttConnect()

is getting called:

eth.getIP(function(f,ip) {
    console.log("IP: ",ip);
    mqttConnect();
  });

code:

var turnedOFF = 1;

var MQTT_HOST = "192.168.0.22";
var PATH = "/mydevice/";
var mqtt;
var eth;

function mqttMessage(pub) {
  console.log(
     "MQTT=> ",pub.topic,pub.message);
  if (pub.topic==PATH+"onoff") {
    var v = pub.message!=0;
    digitalWrite(B3, !v);
    mqtt.publish(PATH+"1/status", v?1:0);
  }
}

function mqttConnect() {
  console.log("mqttConnect");
  mqtt = require("MQTT").connect({
    host: MQTT_HOST,
  });
  mqtt.on('connected', function() {
    console.log("MQTT connected");
    // subscribe to wildcard for our name
    mqtt.subscribe(PATH+"#");
  });
  mqtt.on('publish', mqttMessage);
  mqtt.on('disconnected', function() {
    console.log("MQTT disconnected... reconnecting.");
    setTimeout(function() {
      mqtt.connect();
    }, 1000);
  });
}

setInterval(function() {
  if (!mqtt) return;
  mqtt.publish(
    PATH+"cputemp",
    E.getTemperature());
}, 2*60*1000);

function trigger() {
  turnedOFF = 1;
  digitalPulse(B3,0,1000);
  digitalWrite(LED1, 0);
  console.log("digitalWrite");
}

setWatch(function(e) {
  digitalWrite(LED1, e.state);
  trigger();
}, BTN, { repeat: true });

function onInit() {
  console.log("Connecting to Ethernet");

  SPI2.setup({ mosi:B15, miso:B14, sck:B13 });
  eth = require("WIZnet").connect(SPI2, B10);

  eth.setIP();

  //eth.getIP();
  eth.getIP(function(f,ip) {
    console.log("IP: ",ip);
    mqttConnect();
  });

}

[espruino-discuss2]

Posted at 2018-07-23 by d0773d

I figured this out. setIP() returns true when it successfully finishes.

Updated onInit code:

function onInit() {
  console.log("Connecting to Ethernet");

  SPI2.setup({ mosi:B15, miso:B14, sck:B13 });
  eth = require("WIZnet").connect(SPI2, B10);

  console.log("Connect?: " + isConnected);

  isConnected = eth.setIP();
  console.log("Connect?: " + isConnected);

  if (isConnected == true) {
    mqttConnect();
  }

  //eth.getIP();
  eth.getIP(function(f,ip) {
    console.log("IP: ",ip);
    mqttConnect();
  });

}

[gfwilliams]

Posted at 2018-07-23 by @gfwilliams

Great! I think one issue you have might be that Ethernet.getIP doesn't use a callback so never calls your function - it just returns the IP as-is.

That's definitely an issue, as it should use the same form as other networking APIs to avoid this kind of confusion. I just filed an issue to get it fixed.

[espruino-discuss2]

Posted at 2018-07-23 by d0773d

@gordon I think I meant to say setIP instead of getIP in my original post. I would like to execute mqttConnect(); after espruino successfully connects to the network via a callback. Implementing a callback on both setIP and getIP would be great. Thank you for submitting an issue.