Intel Galileo and Intel Galileo Gen 2: API Features and Arduino Projects for Linux Programmers by Ramon Manoel Carlos

Author:Ramon, Manoel Carlos [Ramon, Manoel Carlos]
Language: eng
Format: epub
ISBN: 9781430268390
Publisher: Apress
Published: 2014-12-25T22:00:00+00:00

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Intel Centrino Wireless-N 135

2

Dual band antennas 350mm cable 2118060-1 TE connectivity

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1

2

3V coin battery

Coin battery holder case

Wires jumper 10cm long 1/4w female-male

System and Hardware Clock

Maybe you are wondering why I am discussing the system and hardware clock if all you have to do is simply post on Twitter? One of the key elements for computing the string base and getting authorization to post on Twitter is a timestamp.

This timestamp must be in sync with the rest of world, in other words, your board must have a valid and actual time and date. If you type date in the terminal shell as soon you log in, you will see something like this:

clanton login: root

root@clanton:~# date

Mon Jan 1 00:19:31 UTC 2001

This date represents the system time in UTC maintained by the kernel software. To check the hardware clock, use the hwclock command:

root@clanton:~# hwclock

Mon Jan 1 00:19:56 2001 0.000000 seconds

If you try to get the timestamp based on one of these dates, Twitter will not authorize because they are not synchronized with the real time.

There are several ways to fix the date and time according to the busybox help manual:

date

date [OPTIONS] [+FMT] [TIME]

Display time (using +FMT), or set time

Options:

[-s] TIME Set time to TIME

-u Work in UTC (don't convert to local time)

-R Output RFC-822 compliant date string

-I[SPEC] Output ISO-8601 compliant date string

SPEC='date' (default) for date only,

'hours', 'minutes', or 'seconds' for date and

time to the indicated precision

-r FILE Display last modification time of FILE

-d TIME Display TIME, not 'now'

-D FMT Use FMT for -d TIME conversion

Recognized TIME formats:

hh:mm[:ss]

[YYYY.]MM.DD-hh:mm[:ss]

YYYY-MM-DD hh:mm[:ss]

[[[[[YY]YY]MM]DD]hh]mm[.ss]

One format not documented here is MMDDhhmmYYYY. Change the date and clock using your preferable format. The following command uses YYYY-MM-DD hh:mm[:ss]:

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