function v=wakeupsub(spo)

%     SOSI-M2 V1.0 MATLAB M-file
%
% Try to wake up SOSI-M2 by sending 'e' character.
% If in channel set mode, 'e' will exit also. Listen
% for string containing '[show]' to indicate active state
%
% spo: serial port object
%
% v: return success
%     1: SOSI awake
%     0: failed to find SOSI

delayt=0.05;
v=0;

% Wakeup 8 tries
for i=1:8
    disp(sprintf('Wakeup Try: %d',i));
    n=spo.BytesAvailable;
    fprintf(spo,'%s\n','e')           % Send command
    pause(delayt);                  % Delay
    if spo.BytesAvailable > (n+30)
        s=fscanf(spo);              % Read result
        if ischar(s)
            if findstr(s,'[show]')>0
                break;
            end
        end
    end
    if i==8
        fclose(spo);
        disp('Cannot wake SOSI');
        return;

    end
    pause(0.5);
end
v=1;
return