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Linux/CC2531: Z-STACK-LINUX-GATEWAY is restart after write error to USB error ([ERR] npi_ipc_errno 0x02030100)

Zdenek Bouska
Prodigy 130 points
Part Number: CC2531
Other Parts Discussed in Thread: Z-STACK

Tool/software: Linux

I am using Z-STACK-LINUX-GATEWAY (from Z-Stack_Linux_Gateway-1_0_1-src-linux-installer.run) on Beagle Bone Black with CC2531 USB dongle.

I have loaded (CC2531-GW-ZNP_38724.hex) into CC2531USB rev 2.4. 

The GW is working, but sometimes I receive this error:

[ERR] npi_ipc_errno 0x02030100 (=NPI_LNX_ERROR_UART_SEND_FRAME_FAILED_TO_WRITE, failed write to USB (/dev/ttyACM0)). 

This error results in Z-Stack_Linux_Gateway to be restarted (GW is not working for 20 seconds which is unacceptable for us).

Is this a HW limitation of CC2531 USB dongle?

  • 0
    TI__Genius 10650 points
    Does this issue occur only in certain scenarios such has when a lot of messages are sent back to back to the ZNP, can you please provide steps to reproduce?
  • 0 in reply to Suyash Jain
    Prodigy 130 points

    Yes, it happens when there is more messages, but not really that much.

    How to reproduce it: I have wrote a simulation of a switch for test purposes which sends ON, waits for reply, sends OFF, waits for reply, sends ON, ...

  • 0 in reply to Zdenek Bouska
    TI__Expert 8950 points
    Hi,

    At what rate are you sending the on/off commands? I assume they are being sent to a Zigbee light device which is connected to your network? Can you post a sniffer log of your test?
  • 0 in reply to JasonB
    Prodigy 130 points
    These on/off commands are sent to the GW endpoint 6 (the idea is to bind Zigbee switch with wire light connected to beagle by relay).
    I am sending those on/off commands as fast as possible: On/Off commands is sent afer it receives the reply for Off/On command after 5 seconds the reply is not received.

    It may be neccessary to also toggle Zigbee light from the GW during the test.
    I will prepare detailed steps how to reproduce this.

    I will try to also capture a sniffer log.
  • 0 in reply to Zdenek Bouska
    Prodigy 130 points

    I have found possible fix or workaround. Please let me know what do you think about this solution.

    See this patch: against sources in Z-Stack_Linux_Gateway-1_0_1-src-linux-installer.run

    diff --git a/Source/Projects/tools/LinuxHost/ipclib/server/npi_lnx_uart.c b/Source/Projects/tools/LinuxHost/ipclib/server/npi_lnx_uart.c
index 44848ab..ac521b0 100644
--- a/Source/Projects/tools/LinuxHost/ipclib/server/npi_lnx_uart.c
+++ b/Source/Projects/tools/LinuxHost/ipclib/server/npi_lnx_uart.c
@@ -846,9 +846,24 @@ static int npi_write(const void *buf, size_t count)
 	}
 #endif //__DEBUG_TIME__
 
-	pthread_mutex_lock(&npi_write_mutex);
-	result = write(npi_fd, buf, count);
-	pthread_mutex_unlock(&npi_write_mutex);
+	//Try write five times with 1 second delay for Interupted system call error
+	for (size_t i = 0; i < 5; i++)
+	{
+		pthread_mutex_lock(&npi_write_mutex);
+		result = write(npi_fd, buf, count);
+		int writeErrno = errno;
+		pthread_mutex_unlock(&npi_write_mutex);
+		bool interruptedSystemCallError = (result == -1) && (writeErrno == EINTR);
+		if (interruptedSystemCallError)
+		{
+			debug_printf("[UART] write try %d/5 resulted in Interrupted system call error\n", i + 1 );
+			sleep(1);
+		}
+		else
+		{
+			break;
+		}
+	}
 
 #ifdef __DEBUG_TIME__
 	if (__DEBUG_TIME_ACTIVE == TRUE)