add instructions to setup emulator

d2d_emulator_setup.txt

+Scenario 1 : Off-network UE2UE link
+SynchREF UE (UE1)
+
+UE1(eth0 - 10.10.10.1)--------UE2(eth0 - 10.10.10.2)
+
+
+Prepare the environment:
+ - git clone https://gitlab.eurecom.fr/matzakos/LTE-D2D.git
+This branch contains all the current development for DDPS
+ - UE MAC<-> UE MAC for Scenario 1
+ - eNB MAC<->UE MAC (NFAPI Transport)
+ - RRC Extensions for “on-network” cases
+ 
+NFAPI configuration (required even for Scenario 1 target)
+ - git clone https://github.com/cisco/open-nFAPI.git
+ - cd open-nfapi
+ - patch -p1 --dry-run < $OPENAIR_HOME/open-nfapi.oai.patch
+Validate that there are no errors
+ - patch -p1 < $OPENAIR_HOME/open-nfapi.oai.patch
+ 
+OAI build/execute
+ - export NFAPI_DIR=XXX (place where NFAPI was installed)
+ - cd cmake_targets
+ - ./build_oai --UE
+ - cd lte_build_oai/build/
+ - cp ../../../targets/bin/.ue* .
+ - cp ../../../targets/bin/.usim* .
+ - sudo insmod ../../../targets/bin/ue_ip.ko
+ UE1: 
+ - sudo ifconfig oip0 10.0.0.1
+ - sudo iptables -A POSTROUTING  -t mangle -o oip0 -d 224.0.0.1 -j MARK --set-mark 3
+ - (if necessary) sudo route add default gw 10.10.10.1 eth0
+UE2:
+ - sudo ifconfig oip1 10.0.0.2
+ - sudo iptables -A POSTROUTING  -t mangle -o oip1 -d 224.0.0.1 -j MARK --set-mark 3
+ - (if necessary) sudo route add default gw 10.10.10.1 eth0
+Run UE1, then UE2
+- sudo ./lte-softmodem-stub -U --emul_iface eth0
+
+Test with Ping
+- Sender - UE1: ping -I oip0 224.0.0.1
+- Receiver - UE2: using wireshark
+
+Test with Iperf
+- Sender - UE1: iperf -c 224.0.0.1 -u -b 0.1M --bind 10.0.0.1 -t 100
+- Receiver - UE2: sudo ./mcreceive 224.0.0.1 5001 
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