Pardon my ignorance, but wtf is a OTG cable ? I've been using computers since my trusty C64 back in 1986 but I have no idea what an OTG cable is. Never heard of it.
Do you mean a USB cable ? Do I need one with the Spark and my iPhone 6s ?
I might have to summon the energy to look it up.
OGT stands for On The Go. It’s very common among Samsung and Andriod users. You don’t need one necessarily for your iPhone 6S but I found that with my iPhone7 Plus I get a much more solid connection with no risk of losing my WiFi Connection. Be aware not all OTG cables are the same, some don’t work. Also I found as others have that you need to follow certain sequence in order for it to work. Here is the post I did back in august
I just tried using an OTG cable on my iPhone 7 Plus. The sequence in which you do it seems to be important. This is what works every time for me.
First I turned off wifi on my phone and entered Airplane Mode
OGT Cable Set up on Spark Remote
1) switch on remote (nothing plugged in)
2) switch on spark
3) Wait for green light on controller
4) switch on ipad/iphone
5)open up DJI Go4 App you will see a grey screen.
6) plug in lightning cable to ipad/iphone
7) plug in usb end of lightning into the otg cable
8) plug otg cable into remote
9) pad/controller will make a sound to make connection
10) On your iphone you'll get the "This accessory may not be etc, etc" HIT dismiss to ignore message
11) Camera view pops up.
The one that seems to work for everyone is by Ugreen on Amazon sold in a 2 pack
Look for my OTG Cable post on this forum from a few months ago.