forked from FOSS/BangleApps
66 lines
1.8 KiB
JavaScript
66 lines
1.8 KiB
JavaScript
function setAGPS(data) {
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var js = jsFromBase64(data);
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try {
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eval(js);
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return true;
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}
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catch(e) {
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console.log("error:", e);
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}
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return false;
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}
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function jsFromBase64(b64) {
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var bin = atob(b64);
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var chunkSize = 128;
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var js = "Bangle.setGPSPower(1);\n"; // turn GPS on
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var gnss_select="1";
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js += `Serial1.println("${CASIC_CHECKSUM("$PCAS04,"+gnss_select)}")\n`; // set GNSS mode
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// What about:
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// NAV-TIMEUTC (0x01 0x10)
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// NAV-PV (0x01 0x03)
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// or AGPS.zip uses AID-INI (0x0B 0x01)
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for (var i=0;i<bin.length;i+=chunkSize) {
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var chunk = bin.substr(i,chunkSize);
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js += `Serial1.write(atob("${btoa(chunk)}"))\n`;
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}
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return js;
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}
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function CASIC_CHECKSUM(cmd) {
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var cs = 0;
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for (var i=1;i<cmd.length;i++)
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cs = cs ^ cmd.charCodeAt(i);
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return cmd+"*"+cs.toString(16).toUpperCase().padStart(2, '0');
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}
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function updateLastUpdate() {
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const file = "agpsdata.json";
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let data = require("Storage").readJSON(file, 1) || {};
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data.lastUpdate = Math.round(Date.now());
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require("Storage").writeJSON(file, data);
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}
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exports.pull = function(successCallback, failureCallback) {
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let uri = "https://www.espruino.com/agps/casic.base64";
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if (Bangle.http){
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Bangle.http(uri, {timeout:10000}).then(event => {
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let result = setAGPS(event.resp);
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if (result) {
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updateLastUpdate();
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if (successCallback) successCallback();
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} else {
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console.log("error applying AGPS data");
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if (failureCallback) failureCallback("Error applying AGPS data");
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}
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}).catch((e)=>{
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console.log("error", e);
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if (failureCallback) failureCallback(e);
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});
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} else {
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console.log("error: No http method found");
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if (failureCallback) failureCallback(/*LANG*/"No http method found");
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}
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};
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