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/sys/mcuimg.bin is just another file on SLFS, no reason to give it
special treatment. Preserve backward compatibility with old bundles:
translate sys_mcuimg.bin -> /sys/mcuimg.bin

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SL requires cert and key to be separate files in DER format.

Date verification is disabled for now.

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 * Add TI compiler
 * Remove cc3200prog, we don't use it
 * Update to Xenial (new Ubuntu stable release).
   It has ARM toolchain in the repos too, which is nice (no more PPA).

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It's barely used in our code and conflicts with ont in SimpleLink SDK

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Fix WS connect address
Only update graphs when connected

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In SDK 1.2.0 TI decided to stop resetting NWP before sl_Start, which in
practice means that sl_start will hang on subsequent runs after the first.

See this post for details and suggested solution:

https://e2e.ti.com/support/wireless_connectivity/simplelink_wifi_cc31xx_cc32xx/f/968/p/499123/1806610#1806610

However, since they don't provide OS_debug variant of simplelink.a and
adding another project dependency will complicate our demo even more,
we just take the required bit of code.

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Mg_hello is a simpler example for CC3200
File upload form is served on / if index.html does not exist
and always available on /upload

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It'll be used for MSP432 as well

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Factor out MG task for clarity and ease of reuse.

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Explicitly loosen them on the "big" platforms.

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This allows the bazel `BUILD` file to coexist on case insensitive
filesystems such as on OSX.

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This is less than ideal, but will do for now.

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Move data collection out of main.c

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This is to make it compatioble with "devices" used in TI's libc.

Files without any "device" go to SPIFFS.

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A few tweaks to TI example
Clean up mbuf_insert code a bit

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And use stdout for CC3200 demo because
  (1) an apparent bug which causes output sent to stderr to be
      printed v-e-r-y s-l-o-w-l-y (yes, it is really like that;
      https://e2e.ti.com/support/development_tools/code_composer_studio/f/81/t/501881)
  (2) in CCS it is printed in BLOOD RED, which is annoying

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Disable CGI automatically, as it's never going to work.

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It is also possible to control LED by sending a command:
  {"t": 1, "v": 0/1/2}
0/1 = off/on, 2 = toggle

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Some yak shaving along the way

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Moved filesystem-related code out of SJS and into common.
Made it possible to have one, both or no filesystems enabled.
FailFS is now SimpleLinkFS, SLFS (ahem).

Example just serves a "Hello, world!" index page for now.

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