android: use gbSend for gb activity tracks

apps/android/boot.js

@@ -232,25 +232,22 @@
         recs = recs.slice(recs.indexOf(event.id)); // FIXME: Currently does not handle if the last fetched log was deleted on the watch, so that there won't be any entry corresponding to `event.id`
         recs.shift();
         }
-        Bluetooth.println("");
-        Bluetooth.println(JSON.stringify({t:"trksList", list: recs})); // TODO: split up in multiple transmissions?
+        gbSend({t:"trksList", list: recs}); // TODO: split up in multiple transmissions?
       },
 
       "fetchRec": function() { // GB({t:"fetchRec", id:"20230616a"})
         // TODO: Decide on what names keys should have.
         let log = require("Storage").open("recorder.log"+event.id+".csv","r");
         let line = log.readLine();
         while (line) {
-          Bluetooth.println("");
-          Bluetooth.println(JSON.stringify({t:"actTrk", log:event.id, line:line, last:"false"}));
+          gbSend({t:"actTrk", log:event.id, line:line, last:"false"});
           line = log.readLine();
           if (!line) {
-            Bluetooth.println(JSON.stringify({t:"actTrk", log:event.id, line:"end of recorder log", last:event.last}));
+            gbSend({t:"actTrk", log:event.id, line:"end of recorder log", last:event.last});
           }
         }
       },
 
-
       "nav": function() {
         event.id="nav";
         if (event.instr) {