retriving "Field List" in Node.Js Adaptor

[giuseppe.corti]

Hi Tugan,

Please note that the "buddy_list" Item requested by the client is managed in command mode. This implies that the updates the Adapter send to the server must have some constraints; in particular must always contain fields "command" and "key".
So the third parameter of the update method should be a JavaScript object with a structure like this:
{command: "ADD", key: "Guest101"}

In your case the JSON.stringify of buddyList results in string an finally in something of incomprehensible for the Lightstreamer server:
{19=e, 17=", 18=k, 33=}, 15=", 16=,, 13=D, 14=D, 11=", 12=A, 21=", 20=y, 22=:, 23=", 24=G, 25=u, 26=e, 27=s, 28=t, 29=5, 3=o, 2=c, 10=:, 1=", 0={, 30=7, 7=n, 6=a, 32=", 5=m, 31=5, 4=m, 9=", 8=d}

You should simply use the object buddylist in the update method:
dataProvider.update(LIST, false, buddyList);

HTH,
Giuseppe