CL: Add MG_MK_STR_N() and mg_str_starts_with()

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Should use length of the exected response, not the response sent by the user.

CL: mg: Fix digest auth result comparison

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CL: none

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CL: none

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CL: Update mbedTLS to 2.13.1

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CL: mg: Check HTTP chunk size, ensure it's reasonable

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Clean the HTTP connection state when ia request/response has been fully
buffered and handler invoked.

Fixes https://github.com/cesanta/mongoose/issues/971

CL: mg: Fix handling of keepalive HTTP requests/responses

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Go back to Ubuntu 16.04 and older gcc-arm (4.9.3).

Boot loader just won't run when compiled with newer GCC (7.x).
It's likely that it can be fixed with compile switches but I couldn't figure it out quickly, so going to just downgrade for now to get it back to workign state.

CL: CC3200: Fix boot loader regression

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CL: Add mgos_gpio_blink()

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mbedTLS is just another lib now

CL: Use mbedTLS from mongoose-os-libs/mbedtls

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CL: Integrate https://github.com/cesanta/mongoose/pull/667, fix documentation

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CL: none

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CL: Docs nits

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 * Update CubeL4 to 1.13.0
 * Rebuild OurTLS with `-DMBEDTLS_X509_CA_CHAIN_ON_DISK`
 * Add `-Wextra` and fix build issues

CL: Update STM32 build image

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Listeners still TODO

CL: ISM43XXX networking support (TCP, UDP client)

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CL: STM32: Make LWIP optional

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Can be used for cases where device has no networking but mongoose is still needed for its event loop.

CL: mg: Add net_if_null, a no-op net interface

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 * Change return type of mg_mgr_poll to return number of events
 * Add mg_mgr_min_timer
 * Refactor main poll loop to remove LwIP-specific stuff

CL: Refactor mg polling

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CL: Fix https://github.com/cesanta/mongoose/issues/962 - file upload on windows

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A smattering of other related changes

CL: STM32 OTA support for L475-IOT01 and DISCO-F746

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CL: Mongoose 6.12

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h/t @M4GNV5

Fixes https://github.com/cesanta/mongoose/issues/943
Closes https://github.com/cesanta/mongoose/issues/944

CL: mg: Don't touch send_mbuf when sending MQTT messages

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Fixes https://nvd.nist.gov/vuln/detail/CVE-2018-10945

CL: mg: Fix body length calculation in mg_handle_cgi

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Closes https://github.com/cesanta/mongoose/pull/955

CL: mg: Add host name verification for OpenSSL

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CL: Make esp8266 compilation a little less verbose

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Closes https://github.com/cesanta/mongoose/pull/945

CL: Fix build with CS_ENABLE_STDIO=0

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CL: Add mg_strstrip: trims whitespace at the ends of s

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Use vararg macros for this.

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h/t @YankunLi

Closes https://github.com/cesanta/mongoose/pull/939

CL: mg: Fix a bug in mg_mgr_init_opt with opts.num_ifaces

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CL: mos support for LFS (littlefs) https://github.com/ARMmbed/littlefs

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Do not clear buffer at the end of multipart request to allow following request to proceed.

Closes https://github.com/cesanta/mongoose/pull/940

CL: mg: Fix pipelining issue with multipart upload

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CL: Add missing CC3220 sub-header to mongoose.h

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curl -F file1 -F file2 ...

Add a unit test and fix a minor memory leak when returning an error.

CL: mg_file_upload_handler: Support multiple files

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Set CLOSE_IMMEDIATELY flag when destroying conn.
This avoid some races in LWIP adapter.

CL: mg_lwip: Fix race during clean conenction teardown

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startup cleanup on CC3220

CL: none

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