'Receive options' is the name of the byte at offset 14 of the 'Receive Packet' frame (0x90) or offset 20 of the 'Explicit Rx Indicator' frame (0x91). This byte is a set of single bit flags of which bits 0, 1 and 5 are defined in the S2C XBee ZB firmware. This is according to the 'XBee/XBee-PRO S2C ZigBee - User Guide'.
My question relates to bit 6 (0x40 expressed in byte form) of the Receive options byte. The user guide for S2C does not mention it, while it IS defined in the user guide for S2B modules. From the S2B user guide...
0x01 - Packet Acknowledged
0x02 - Packet was a broadcast packet
0x20 - Packet encrypted with APS encryption
0x40 - Packet was sent from an end device (if known)
Note Option values can be combined. For example, a
0x40 and a 0x01 will show as a 0x41. Other possible
values 0x21, 0x22, 0x41, 0x42, 0x60, 0x61, 0x62.