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I have a Raspberry Pi3 running Ubuntu 16.04. I am logged in via ssh.

I want to connect a hardware device to UART0 at GPIO pins 8 and 10. As best I can figure this should correspond to /dev/ttyAMA0. But I try this shell command and the terminal hangs, the command never returns and even control-C does not work.

echo "testing 123" > /dev/ttyAMA0

It is not a simple permission problem. I'm in the dailout group. Here is what "ls" says

crw-rw---- 1 root dialout 204, 64 Jun  1 16:26 /dev/ttyAMA0

Here is the lines from dmesg | grep ttyAMA

[    0.833340] 3f201000.uart: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2
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    Open the device with screen like screen /dev/ttyACM0 <baud rate>. Personally I use byobu-screen, it might be easier, it opens session window automatically. Then try typing and press enter. There's other ways, too, but screen is easiest. – Sergiy Kolodyazhnyy Jun 2 '18 at 1:58

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