BangleApps/apps/widagps/widget.js

if (!global.WIDGETS) {
  WIDGETS = {};
  Bangle.loadWidgets();
  var isTest = true;
}

(function(){
  var warnTime = 24*60*60000; //warn missing data
  var nextTime = 12*60*60000; //time between requests 
  var retryTime = 10*60000; //time between retries 

  const JSON_FILE = "agpsdata.json";
  var isRequesting = false;
  var lastAGPS = 0;
  var nextGet = null;
  
  const WIDGET_ID = "widagps";  
  WIDGETS[WIDGET_ID]={
    area:"tl",
    width:24,
    draw:function() {
      var w = 0;
      var x = this.x, y = this.y;
      g.reset();
      if (isRequesting) {
        g.setColor("#00f");
        w = 24;
      }
      else {
        if (Date.now() - lastAGPS > warnTime) {
          g.setColor("#f00"); 
          w = 24;
        }
      }
      if (w) {
g.drawImage(atob("FBQBAAAABgAAYAAPAACwABOAATgAI8ACPABD4AQ+AEPgD8EAg/AQP4AD+CD/wjD8WAHmAAY="), x + 1, y + 1);
      }
      if (WIDGETS[WIDGET_ID].width != w) {
        WIDGETS[WIDGET_ID].width = w;
        Bangle.drawWidgets();
      }
    }
  };

  var _GB = global.GB;

  global.GB = function(msg) {
    //console.log(msg);
    if (msg.t == "http") {
      applyAGPS(msg.resp);
    }
    if (_GB) {
      _GB(msg);
    }
  }

  function nextAGPS(when) {
    if (nextGet) {
      clearTimeout(nextGet);
      nextGet = null;
    }
    console.log("Next AGPS request:", new Date(Date.now() + when));
    nextGet = setTimeout(() => {
      getAGPS();
    }, when);
  }

  function applyAGPS(data) {
    isRequesting = false;
    var success = false;
    if (data) {
      success = setAGPS(data);
    }
    if (success) {
      lastAGPS = Date.now();
      nextAGPS(nextTime);
      require("Storage").writeJSON(JSON_FILE, {lastAGPS: lastAGPS});
    }
    else {
      console.log("Failed to apply AGPS data");
      nextAGPS(retryTime);
    }
    Bangle.drawWidgets();
  }

  function setAGPS(data) {
    var js = jsFromBase64(data);
    Bangle.setGPSPower(true, "agpsdata");
    try {
      eval(js);
      Bangle.setGPSPower(false, "agpsdata");
      return true;
    }
    catch(e) {
      console.log("Error:", e);
    }
    Bangle.setGPSPower(false, "agpsdata");
    return false;
  }

  function jsFromBase64(b64) {
    var bin = atob(b64);
    var chunkSize = 128;
    var js = "";//"Bangle.setGPSPower(1);\n"; // turn GPS on
    var gnss_select="1";
    js += `Serial1.println("${CASIC_CHECKSUM("$PCAS04,"+gnss_select)}")\n`; // set GNSS mode
    // What about:
    // NAV-TIMEUTC (0x01 0x10)
    // NAV-PV (0x01 0x03)
    // or AGPS.zip uses AID-INI (0x0B 0x01)

    for (var i=0;i<bin.length;i+=chunkSize) {
      var chunk = bin.substr(i,chunkSize);
      js += `Serial1.write(atob("${btoa(chunk)}"))\n`;
    }
    return js;
  }

  function CASIC_CHECKSUM(cmd) {
    var cs = 0;
    for (var i=1;i<cmd.length;i++)
      cs = cs ^ cmd.charCodeAt(i);
    return cmd+"*"+cs.toString(16).toUpperCase().padStart(2, '0');
  }

  function getAGPS() {
    isRequesting = true;
    if (Bluetooth.println) {
      console.log("On device");
      Bluetooth.println(JSON.stringify({t:"http", url:"https://www.espruino.com/agps/casic.base64"}));
    }
    else {
      console.log("Testing on Emulator");
      setTimeout(() => {
        GB({t:"http", resp:testData});
      }, 5000);
    }
    //check for request timeout
    setTimeout(() => {
      if (isRequesting) {
        applyAGPS();
      }
    }, 10000);
    Bangle.drawWidgets();
  }
  
  var data = require("Storage").readJSON(JSON_FILE);
  if (data && data.lastAGPS) {
    //lastAGPS = data.lastAGPS;
  }  
  
  nextAGPS(Math.max(0, nextTime - (Date.now() - lastAGPS)));
  NRF.on('connect', () => {
    if (Date.now() - lastAGPS > warnTime) {
      nextAGPS(0);
    }
  });
  
  var testData = "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";

})()
if (global.isTest) {
  Bangle.drawWidgets();
}