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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

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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.

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

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

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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.

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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

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

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

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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

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

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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

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[...] 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.

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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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