gr-hydra

GETTING STARTED

sudo apt install build-essential cmake libfftw3-dev uhd-host libuhd-dev gnuradio-dev libopencv-dev libzmqpp-dev swig

Clone the repository and enter in the created folder (default: gr-hydra). Execute the following commands:

mkdir build; cd build;
cmake ../
make
sudo make install
sudo ldconfig

First install the STANDARD VERSION. Go to gr-hydra/grc_blocks and execute the following commands:

mkdir build; cd build;
cmake ../
make
sudo make install

For all examples we:

We associate a terminal ID to a all terminals open in the form T_n, where n is the terminal number. Wherewer needed we are going to refer to a specific terminal by specifying its ID.
refer to USRP_n as a pair of PC+USRP, where n indentifies one of the pair. Ex: USRP_1 is what you consider your 1st PC+USRP, while USRP_2 is your second. Whenever we refer to USRP_1 you execute the instructions in that machine.

Open a terminal in USRP_1 (T1). Start the Hydra-Server flowgraph:
```
python grc_blocks/app/hydra_gr_server_example.py
```
Open a terminal in USRP_1 (T2). Start the client that request 2 end-to-end TX/RX slices:
```
python grc_blocks/app/hydra_gr_client_2tx_2rx_pdu_gen.py
```
Open a terminal in USRP_2 (T3). Start the flowgraph that receives the messages (PDU) transmitted in slice 1:
```
python grc_blocks/app/usrp_vr1_pdu_gen.grc
```
In T3 you should see the log of messages being received from USRP_1:
```
LOG
LOG
LOG
LOG
```
In T2 you should see the log of messages being received from USRP_2:
```
LOG
LOG
LOG
LOG
```
If you have only 2 USRP: stop the flowgraph in T3. Otherwise go to next step.
Open a terminal (T4) in USRP_3 (or USRP_2 if you have only 2 USRPs). Start the flowgraph that receives the messages (PDU) transmitted in slice 2:
```
python grc_blocks/app/usrp_vr2_pdu_gen.grc
```
In T2 you should see the log of messages being received from USRP_3 (or USRP_2):
```
LOG
LOG
LOG
LOG
```
In T4 you should see the log of messages being received from USRP_1:
```
LOG
LOG
LOG
LOG
```

Cmake cannot find FFTW ?

Put the file in https://github.com/jedbrown/cmake-modules/blob/master/FindFFTW.cmake in the folder /usr/share/cmake-2.8/Modules/