Steve Ciarcia Editor's Circuit Cellar May 2010 PDF

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The servmon_timer() function is called periodically every second. First, it checks whether TIME_BETWEEN_TESTS seconds have elapsed since the last connec- tion attempt, and it sets a timeout state in that case. Next, it iterates to the the next service to test if its TIME_WAITING_FOR_CONNECTION seconds interval has elapsed. h): #define TIME_WAITING_FOR_CONNECTION 5 /* in seconds */ #define TIME_BETWEEN_TESTS 10 /* in seconds */ The main code for testing a service is provided in Listing 1. The telnetd server is used to configure the device remotely.

3-V device (MCU) to a 5-V device (LCD), so no level shifters are needed. May 2010 – Issue 238 SOFTWARE 42 The software is written in C. The code is built around the WIZnet driver, using the Arduino implementation. Internet protocols require specific byte ordering. Dedicated functions are needed to convert between host and network Endianness. The following new components were developed. The main service testing function is servmon_tcpc(). It uses client mode TCP to check the availability of a service.

The code in Listing 2 parses the next item, with ppc pointing to the last item. In Listing 3, the L command prints out the current list of services and their last known states (0-service down, 1-service operating). Use the C command to clear the entire list of services to monitor. The lcdprintd server simply prints whatever it receives from the TCP socket. This is useful for the network administrator to have a peek at important messages from all servers in the network (see Photo 2c). 100 is the IP assigned to it by DHCP): watch -n 60 'hddtemp /dev/sd?

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Circuit Cellar May 2010 by Steve Ciarcia Editor

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