message: fix channel nums in test script
diff: @@ -145,7 +145,7 @@ def main ():
  columns = list ()
  for i in range (len (total_channels) - 1):
  - columns.append ('channel_%d' % i)
  + columns.append ('channel_%d' % (int(total_channels[i]) - 1))
  columns.append ('timestamp')
  df = pd.DataFrame (np.transpose (data))
  