Proper steps for working on Theta API v2.1

THETA API Usage
4

Change the API version once at the beginning of the session. You don’t need to have this in the same command as takePicture.

You can use info or state to check to see the camera is still connected. info uses GET and may be easier.

Set API Version

setApiV2 = function() {
    var args = {
    data: { "name": "camera.setOptions",
          "parameters":{
            "sessionId": "SID_0001",
            "options": {
              "clientVersion": 2
            }
          } 
        },
    headers: { "Content-Type": "application/json" }
};
    client.post("http://192.168.1.1:80/osc/commands/execute", args, function (data, response) {
      console.log(data);
    var thetaResponse = document.getElementById('thetaResponse');
    thetaResponse.innerHTML = JSON.stringify(data);
    });
  }

Take Picture

takePicture = function() {
    var args = {
    data: { "name": "camera.takePicture"},
    headers: { "Content-Type": "application/json" }
};
    client.post("http://192.168.1.1:80/osc/commands/execute", args, function (data, response) {
      console.log(data);
    var thetaResponse = document.getElementById('thetaResponse');
    thetaResponse.innerHTML = JSON.stringify(data);
    });
  }

Get File

getImage = function() {
    var lastImageUrl;
    var args = {
      data: {
        "name": "camera.listFiles",
        "parameters": {
          "fileType": "image",
          "entryCount": 1,
          "maxThumbSize": 0
        }
      },
      headers: {"Content-Type": "application/json"}
    }
    client.post("http://192.168.1.1/osc/commands/execute", args, function (data, response) {
     lastImageUrl = data.results.entries[0].fileUrl;
       var download = function(uri, filename, callback){
    request.head(uri, function(err, res, body){
     console.log('content-type:', res.headers['content-type']);
     console.log('content-length:', res.headers['content-length']);

    request(uri).pipe(fs.createWriteStream(filename)).on('close', callback);
  });
};
    console.log(lastImageUrl);
    // download('http://192.168.1.1/files/744a605553442020024b0202cb00f201/100RICOH/R0012006.JPG', '360_images/lastFile.jpg', function(){
    download(lastImageUrl, '360_images/lastFile.jpg', function(){

    });
  });
  }

I have not tried this in over a year. The problems described may be resolved now.