This commit introduces the ability to connect a real hardware device to
the channel simulator.

It is possible to run an eNB with the libchannel_simulator.so as
liboai_device.so and the "usrp" program and have both connected
as if the eNB was directly talking to the USRP device.

For that, a channel can now have a "sample_advance". (The USRP receives
data from the air for subframe N and sends data for subframe N+x in the
future. In this commit x = 2 subframes.)

The following commands can be run to connect an eNB and the "usrp"
program in FDD mode with 25 RBs.

First, run the the channel simulator. In the directory channel_simulator:

    ./channel_simulator

To run usrp, as root, in the directory channel_simulator/usrp:

    ./usrp

To run the eNB, as root:

    CHANNEL_SIMULATOR_RX_FREQUENCY=2 CHANNEL_SIMULATOR_TX_FREQUENCY=1 CHANNEL_SIMULATOR_TX_SAMPLE_ADVANCE=15360 ./lte-softmodem -O [config file]

Then it is possible to connect a COTS UE.

It is also possible to connect openair UE which uses libchannel_simulator.so
as liboai_device.so. For that, run, as root:

    CHANNEL_SIMULATOR_RX_FREQUENCY=1 CHANNEL_SIMULATOR_TX_FREQUENCY=2 CHANNEL_SIMULATOR_RX_SAMPLE_ADVANCE=15360 ./lte-uesoftmodem -C 2680000000 -r 25 --ue-rxgain 140 --nokrnmod

Connecting both the openair UE and a COTS UE, it is possible to send traffic
between the two.

Note: performances need to be improved.

Note 2: the program "channel_simulator" now requires AVX2 instruction set.

Develop Integration Branch: 2019 week 41

See merge request oai/openairinterface5g!689

    initial support for iperf in distributed environment
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

  - Add more IP routes / rules
  - OAI UE should be pingable!
  - Relative time column added to HTML report
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

  -- Adding the python framework of build and test to inria r2lab pipeline
  -- R2LAB pipeline has logCollections and artifacts storing
  -- Python framework should support latest Rel14 OAI openair-cn/cn-cups EPC
  -- Pipeline uses the latest version of booking-lease script (by duration)
  -- Support for distributed smartphone adb servers
  -- Initial scenarios:
     ** Build on one OAI 4G eNB and one OAI 4G UE
     ** Test in FDD band7 / 5MHz / TM1 in noS1 configuration
     ** Test in FDD band7 / 5MHz / TM1 with latest OpenAir-CN-CUPS --> just attachment
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

Develop Integration Branch: 2019 week 36

The following MR are included:

* MR 653 : Feature LTE-M PUSCH CE - 8 Repetitions
* MR 654 : Rfsimu config and CI scripting updates

  -- Properly stopping FlexRan Ctl in case of failure
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

  -- IperfNoS1 when eNB crashed
  -- LTE-M module failed attachment
  -- LTE-M module pinging
Signed-off-by: Raphael Defosseux <raphael.defosseux@eurecom.fr>

fix phy simulators build Pb: move snr_dB global to simulation code, add a channel mode section in configuration for snr_dB ,add a parameter flag in the config module to allow omitting prefix when modifying a parameter (for compatibility of -s option)