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How can I send RBG data over mesh?

Based on the demonstration video of Thingy, I can have a view on Thingy is changing its color when it is given different command using the apps. 

1. As if I want to send RBG( Red, blue, green) commands to nRF52832 with development kit of PCA10040 over mesh, is it practical?

2. Or, must I implement UART over mesh to send RBG (Red, Blue, Green) data command? 

Also, from the video of the period 0:47 to 1:00, I saw that it is told "The phone is connected to only 1 node and the node is a gateway, so when I send a command, the command goes to the Gateway and from the Gateway, it goes to all the nodes."

3. Does it show that we can implement 1-to-1 mesh but we may have many devices as output?

4. As I have known, Thingy is also using nRF52832 as well. But, it is shown that Thingy can be used to control the LEDs with different colors. Is there any example code for it? If I used the 'light switch' example in the folder 'nrf5_SDK_for_Mesh_v2.0.1_src', will it work as shown in the video?

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