transceiver, uhd: exit informatively if no devices are found

Perform a UHD device search before constructing the object,
and inform the user if no device is found.

No device found is the most common reason for the transceiver
to fail with the dreaded error "assuming TRX is dead".

Signed-off-by: Thomas Tsou <ttsou@vt.edu>

git-svn-id: http://wush.net/svn/range/software/public/openbts/trunk@2699 19bc5d8c-e614-43d4-8b26-e1612bc8e597
1 file changed
tree: 5f9a0c20074a24e643c0ed29ba85828eebc84d1d
  1. CommonLibs/
  2. Transceiver52M/