wpantund can not be configured for nrf52840-DK working as NCP

Question

Hi, 
 
 I am trying to follow the OpenThread tutorial to build the nRF52840 NCP: 
 https://codelabs.developers.google.com/codelabs/openthread-hardware/#3 
 I installed the wpantund as the tutorial suggested, but when I try to configure the wpantund using the following command: 
 sudo /usr/local/sbin/wpantund -o Config:NCP:SocketPath /dev/ttyACM0 -o Config:TUN:InterfaceName utun7 -o Daemon:SyslogMask " -info" 
 
 I get the following errors: 
 wpantund[11303]: Starting wpantund 0.08.00d (Nov 14 2019 13:59:00) . . . wpantund[11303]: SOURCE_VERSION = 0.07.01-327-g9e1c0da wpantund[11303]: BUILD_VERSION = 0.07.01-327-g9e1c0da wpantund[11303]: Configuration file "/etc/wpantund.conf" read. wpantund[11303]: Ready. Using DBUS bus ":1.124" wpantund[11303]: Running as root without dropping privileges! wpantund[11303]: SpinelNCPInstance-Protothreads.cpp:412: Requirement Failed (IS_EVENT_FROM_NCP(event) && GetInstance(this)->mInboundHeader == mLastHeader) wpantund[11303]: Resetting and trying again... (retry 1) wpantund[11303]: SpinelNCPInstance-Protothreads.cpp:400: Requirement Failed (event == EVENT_NCP_RESET) wpantund[11303]: Resetting and trying again... (retry 2) wpantund[11303]: SpinelNCPInstance-Protothreads.cpp:400: Requirement Failed (event == EVENT_NCP_RESET) wpantund[11303]: Resetting and trying again... (retry 3) wpantund[11303]: SpinelNCPInstance-Protothreads.cpp:400: Requirement Failed (event == EVENT_NCP_RESET) wpantund[11303]: The NCP is misbehaving: Repeatedly unable to initialize NCP. Entering fault state. wpantund[11303]: State change: "uninitialized" -> "uninitialized:fault" 
 
 I am not sure what should I do next. Anyone could give me some advice? Thanks a lot. 
 
 Best, 
 Zhonghao

RSA · Answer

are you by any chance running your Linux system on a virtual machine? To save you some time (back and forth over the weekend, not likely :p) I had a simmilar issue, which i solved by running linux natively. (driver issue from using open source Virtualbox perhaps?) either way, a thread i created earlier: github.com/.../4168. 
 
 Also make sure to install all packages, if i remeber correcttly, libreadline didn't install automatically during isntallation. I can't remember the exact function of the feature, but nevertheles it seems to be recommended to have it.