PUBLISHED_FROM=9e9047060b688291655ed227d19b7937fa9a147d

PUBLISHED_FROM=082d0bf5e9b06b850382ce502c7f5b4d68a6a328

Which is a slightly modified version from
https://stackoverflow.com/questions/283166/easy-way-to-convert-a-struct-tm-expressed-in-utc-to-time-t-type

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Add checks on the number of subscribe requests per packet and overall per-session subscription limit.

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```
Using port /dev/ttyACM0
[Aug 30 19:33:02.105]
[Aug 30 19:33:02.114] cc32xx_init          c_no_libs 1.0 (20170830-163205/mos8@6587ffd6+)
[Aug 30 19:33:02.123] cc32xx_init          Mongoose OS 2017083016 (20170830-163205/mos8@6587ffd6+)
[Aug 30 19:33:02.130] cc32xx_init          RAM: 253588 total, 240044 free
[Aug 30 19:33:04.430] cc32xx_start_nwp     NWP v3.4.0.0 started, host driver v2.0.1.19
[Aug 30 19:33:04.437] mgos_vfs_dev_open    slfs_container ({"prefix": "spiffs.img.0"}) -> 20005a64
[Aug 30 19:33:04.450] cc32xx_vfs_dev_slfs_ 20005a64 spiffs.img.0.0 262144 0xfffffffffffffffe
[Aug 30 19:33:04.457] mgos_vfs_mount       Mount SPIFFS @ / (dev 20005a64, opts ) -> 20005a74
[Aug 30 19:33:06.102] mgos_vfs_mount       /: size 233681, used: 4016, free: 229665
[Aug 30 19:33:06.108] mgos_vfs_mount       Mount SLFS @ /slfs (dev 0, opts ) -> 20005ed4
[Aug 30 19:33:06.114] mgos_vfs_mount       /slfs: size 0, used: 0, free: 0
[Aug 30 19:33:06.718] mgos_sys_config_init MAC: 04A316459442
[Aug 30 19:33:06.720] mgos_sys_config_init WDT: 30 seconds
[Aug 30 19:33:06.724] Hello, world!
[Aug 30 19:33:06.728] mgos_init            Init done, RAM: 253588 total, 236544 free, 235864 min free
```

PUBLISHED_FROM=7e83c9ddcc642bd324a40e125d6636ece824fb18

For now, we only support SPIFFS-in-a-box, same as CC3200.
On CC3200SF it should be possible to have SPIFFS on built-in flash, but that is left for later.

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Also make CC3200 use newer ARM compiler, generates slightly smaller code.

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And mgos_conf_check_access_n()

PUBLISHED_FROM=c7de937b4f5463ca463d604183a4ee831617bd6d

Achievement unlocked: CC3220 port prints a boot banner.
Then locks up.

Included in this PR is refactoring to pull out common parts to be shared with CC3200.

PUBLISHED_FROM=5fb9d9a00bb9ce7f63dde20bc1876076b76d5257

Fixed bug in websocket handshake:
now adding Sec-WebSocket-Protocol header in handshake response.

PUBLISHED_FROM=e4a71ff9dc4aeec63db40cb7f356dc5b25c1215a

PUBLISHED_FROM=f97569ae2f31ab94ce4875eae4d0a198f719c388

Ignore all the mess, this is just the beginning...

PUBLISHED_FROM=41ab3c5af0b1d07204619dd4d8dc2e84b6a54f32

PUBLISHED_FROM=62c73e5fb4f70e2b5b8824ce092012508640b173

Fix headers that didn't have it

PUBLISHED_FROM=ce8140783d4b661f16278a4a5adc957b21965473

Change the API to heap-allocate the string and get rid of a bunch of fat stack buffers.

PUBLISHED_FROM=c793dc64a9a044a9769d92ea16859f5d704a2181

PUBLISHED_FROM=4306e870e2cab854febb6becc198ca2247e2e002

Write unit tests for some mg_str functions.

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PUBLISHED_FROM=e69e298a51dbe0f9c47184169ecad06eef0676fc

PUBLISHED_FROM=98fb6c78d20a98dfba07ba6671bd51a394bbc4ca

Also amend api_net.js to use returned length.

PUBLISHED_FROM=38e15f9587edf28049c5b9e5f126b4db159910e8

PUBLISHED_FROM=32bda9e86a11cad3b908d211a1f7bc9d27312874

With different filesystem implementations and storage drivers, like grown-ups have :)
This is not currently used to add any new functionality, we still have
only one FS and driver on ESP8266 and ESP32; CC3200 has two: SPIFFS and SLFS.
This will be used soon to implement filesystems on additional SPI flash chips and SD cards.

PUBLISHED_FROM=293960fef82952c505e9b1925aac7724c7308362

 - Move keep alive management up to the Mongoose library
 - Only outgoing control messgaes should reset keepalive timer
 - Add unit test

https://forum.mongoose-os.com/discussion/1155/mqtt-keep-alive-compliance-issue

PUBLISHED_FROM=f86e30744ded53a6f7f96afec066b4ff3b4372c0

Rationale: this is the optimisation to make JS FFI-ed API
work nicer. We don't have strucuture introspection now,
and do not generate offsets automatially. Thus, using a
stable well-known location of the parsed message body is
better, in case of number of HTTP headers macro changes.

PUBLISHED_FROM=55bf25ac77060a9c81dfecd6601f037562530801

PUBLISHED_FROM=cea0fc4db21f5b68fd3e779334989fef84a1637a

PUBLISHED_FROM=533e134a48e0fca55509c3eb16b0a6b64c1188e8

PUBLISHED_FROM=c1310b7d62f3ad6e2f24fea9f5229588c56b0bbe

Remove the specialized URI parser, clean up code a bit.

Fix parsing of URIs with IPv6 hosts (http://[2001:2:3::4]:567/)

PUBLISHED_FROM=968ad97585d928123106ce3828920ee073113f83

PUBLISHED_FROM=c7e3132d55e603f159019e3f0290e01b189e75e0

Not relevant for other platforms

PUBLISHED_FROM=65b8959ee677555e2fb330c84d443e0a93d9fd1c

If http.auth_{domain,file} are configured, all HTTP requests require valid digest authorization header.
This applies to files served by mg_http_serve as well as synamic endpoints such as /update and /rpc.

mongoose-os#229

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