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 - 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

This adds compile-time checks for format strings.

Fix issues exposed by this.

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Merge commits are not explicitly ignored either: they're just naturally
ignored as empty commits.

PUBLISHED_FROM=12871fd4c9b1e9de4e57e13d810bffd98ddba299

Merge commits are not explicitly ignored either: they're just naturally
ignored as empty commits.

PUBLISHED_FROM=2c814104eedd76ee90813488277ecaaf2baf6315

Fixes https://github.com/cesanta/mongoose-os/issues/260

PUBLISHED_FROM=e95076915d52edb2298e3ea386281c277e42c89a

ESP32: 2.0-r6
ESP8266: 2.0.0-1.5.0-r5

This brings updated mbedTLS with support for on-disk CA chains:
https://github.com/cesanta/mbedtls/compare/esp32_2.0-r5...esp32_2.0-r6
ESP8266 gets bigger rollup (ESP32 got those changes earlier, seems ok):
https://github.com/cesanta/mbedtls/compare/esp8266...esp8266_2.0.0-1.5.0-r5

Saves ~1.5K RAM for now, but will allow adding more roots to ca.pem without wasting RAM.

Refactored docker build for ESP8266 in the same way as was done earlier for ESP32.

PUBLISHED_FROM=db8eb0f91875d02266a8baaf1141c0d65eb59674

Other minor fixes.
Also decrease idle poll interval to 100 ms, as a workaround for some cases of incorrect next poll delay computation.

Added HW tests for SSL fetches.

Fixes cesanta/mongoose-os#262

PUBLISHED_FROM=4d19f845768b4b3b990d25959d4211972368d7fc

This prevented hexdump from showing data sent over SSL when using LWIP net_if

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All calls to core LWIP APIs should go through the tcpip thread.

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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.

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Past due timers should be brought forward to restore interval.

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Configured via `debug.std{out,err}_topic`

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As well as URLs without prefix

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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

Connection may not (yet) have a TCP or UDP PCB associated with it.
mg_lwip_if_get_conn_addr should not crash in this case.

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Not relevant for other platforms

PUBLISHED_FROM=65b8959ee677555e2fb330c84d443e0a93d9fd1c

TCP ACK may arrive after the we've corresponding mg_connection has already been closed.
Fixes cesanta/mongoose-os#235

PUBLISHED_FROM=8164b86131ef08c1b2a6a08630920d600b3f91ac

Remote address is not associated with an outgoing UDP socket.
Instead, it is stored in mg_connection.sa

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https://github.com/cesanta/mongoose-os/issues/229#issuecomment-293613426

PUBLISHED_FROM=1c34db7ab2598eca1db0266cc6cdd31c32a16fff

[...] after handing data off to LWIP, do not wait for ACK.
We don't do it in net_if_socket, don't do it here either.
Also prevents multiple send attempt on the same send_mbuf data.

PUBLISHED_FROM=4e5a677ebda84af1514f34299e53ce856a537883

To aid disagnosing cases like https://forum.cesanta.com/index.php?p=/discussion/397/retries-connecting-to-aws-broker

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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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PUBLISHED_FROM=fc98c51254dd94d3f443fb66e49449da7d9e754c

Add `mjs_check_arg()` which checks whether argument is provided, and
checks its type. It simplifies code and makes it smaller (because
error strings are not ad-hoc, so they are not duplicated)

As part of that, also commonize type stringifying: implement
`mjs_stringify_type` and reimplement `mjs_typeof` on top of that.

Use `mjs_check_arg()` in `mjs_string_slice()` and
`mjs_string_char_code_at()`.

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