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CC3220S-LAUNCHXL: I use status = sl_Recv(app_CB.CON_CB.Cid_Info[i].cid, &databuf[1], 1460, 0); to receive the sent data from remote side, but it will return me "0", what does this API return 0 mean and what case it will return me 0?

 the definition of this API's return is " Return the number of bytes received, " seems the databuf is not changed when return is "0".