pi@raspberrypi:~ $ sudo cat /var/log/d0.txt

##### 64.511385616s (     0 ms) opened
##### 64.515921727s (     4 ms) read
##### 64.515939264s (     0 ms) TCIOFLUSH and cfsetiospeed
<<<<< 64.917704115s (   402 ms)
2f 3f 21 0d 0a                                    /?!

>>>>> 64.972493967s (    55 ms)
2f 3f 21 0a 0a                                    /?!

##### 80.237593791s ( 15265 ms) timeout!
##### 80.237881180s (     0 ms) read
##### 80.237922088s (     0 ms) TCIOFLUSH and cfsetiospeed
<<<<< 80.638575125s (   401 ms)
2f 3f 21 0d 0a                                    /?!

>>>>> 80.689662939s (    51 ms)
2f 3f 21 0a 0a                                    /?!

##### 95.917762282s ( 15228 ms) timeout!
#####  0.919207298s (  5002 ms) closed