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peer to peer program of cc3200 sdk

Dear sir,

why we are checking Radio state in the function "SMPL_LinkListen(linkID_t *linkID)" in nwk_api.c file of peer to peer example of 3200sdk.............as we are working with WIFI ,why we need to check Radio wave..............

Requesting to answer all the queries ,My question are,

1)which API is used to send the data to once email and which API is used to send the data from end point to access point?

2)how both EZRF2500 communicate each other,which API is used?

3)which EZRF sends the request signal to start communication,either End point or Access point?

4)Are they both communicate by a single port number of our Router? 

thank you.

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