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BearSSL Max Fragment Length Negotation and Node.js server #5929

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merged 7 commits into from
Apr 11, 2019
Merged

BearSSL Max Fragment Length Negotation and Node.js server #5929

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e94d1e3
Minor bug fixes in Maximum Fragment Length Negotation example, mainly…
Mar 29, 2019
f727636
Minor layout changes to pass travis tests
Mar 29, 2019
092c43d
Merge branch 'master' into feature/MFLN
Apr 1, 2019
532a553
Use PolledTimeout for timeout
Apr 1, 2019
6006e8d
Merge remote and origin
Apr 1, 2019
3ecacf4
Merge branch 'master' into feature/MFLN
Apr 7, 2019
f920652
Merge branch 'master' into feature/MFLN
Apr 11, 2019
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20 changes: 13 additions & 7 deletions libraries/ESP8266WiFi/examples/BearSSL_MaxFragmentLength/BearSSL_MaxFragmentLength.ino
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
// Released to the public domain

#include <ESP8266WiFi.h>
#include <PolledTimeout.h>

#ifndef STASSID
#define STASSID "your-ssid"
Expand All @@ -17,17 +18,22 @@ const char *pass = STAPSK;
void fetch(BearSSL::WiFiClientSecure *client) {
client->write("GET / HTTP/1.0\r\nHost: tls.mbed.org\r\nUser-Agent: ESP8266\r\n\r\n");
client->flush();
uint32_t to = millis() + 5000;
using oneShot = esp8266::polledTimeout::oneShot;
oneShot timeout(5000);
do {
char tmp[32];
memset(tmp, 0, 32);
int rlen = client->read((uint8_t*)tmp, sizeof(tmp) - 1);
yield();
if (rlen < 0) {
break;
}
if (rlen == 0) {
delay(10); // Give background processes some time
continue;
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is delay() required ?
There is no background process except from receiving, storing, but without processing data.
Calling read() often ensures processing them as soon as data are received.

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@Jeroen88 Jeroen88 Apr 10, 2019 •
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@d-a-v If there is no data available yet (rlen == 0), without delay I experienced timeout errors. My assumption is that this is because with no data available the loop that keeps the ESP busy reduces almost to:

do { } while (!timeout)

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I did experienced timeout error @80MHz even with delay(10) or with master. @earlephilhower reminded me that SSL works better @160MHz because "mbed uses EC which is insanely slow".
I had no timeout without delay(10) (your PR) @160MHz.

With delay, average duration over about 20 request is 273.5ms, and 249.6ms without (measuring the while loop).

Can you retry at 160MHz and see if you still have those timeouts (that I have with master @80Mhz) ?

To be honest, I am concerned about this delay and the associated comment which is wrong to me.

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My assumption is that this is because with no data available the loop that keeps the ESP busy reduces almost to: do { } while (!timeout)

I agree with saying the arduino infinite loop way of coding is wrong. In that case we could "delay-and-reduce-cpu-activity-until-a byte-is-received" and this api/call is lacking in our API. We are not in an RTOS, but maybe something is doable for this common case.

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@d-a-v

Can you retry at 160MHz and see if you still have those timeouts (that I have with master @80Mhz) ?

I always run the ESP8266 @ 160MHz when using BearSSL, so I experienced the timeout without the delay @ 160MHz and never tried @ 80MHz.

To be honest, I am concerned about this delay and the associated comment which is wrong to me.

I asume you are not looking for just changing the text of the comment?

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I too can be picky :) There are already two approvals and changes worksforme (and it's nice). So I let it go as-is. When my pickyness will be boiling I'll make a proposal for the comment-only.

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;-)

}
tmp[rlen] = '\0';
Serial.print(tmp);
} while (millis() < to);
} while (!timeout);
client->stop();
Serial.printf("\n-------\n");
}
Expand Down Expand Up @@ -73,11 +79,11 @@ int fetchMaxFragmentLength() {

BearSSL::WiFiClientSecure client;
client.setInsecure();
bool mfln = client.probeMaxFragmentLength("tls.mbed.org", 443, 1024);
bool mfln = client.probeMaxFragmentLength("tls.mbed.org", 443, 512);
Serial.printf("\nConnecting to https://tls.mbed.org\n");
Serial.printf("MFLN supported: %s\n", mfln ? "yes" : "no");
if (mfln) {
client.setBufferSizes(1024, 1024);
client.setBufferSizes(512, 512);
}
client.connect("tls.mbed.org", 443);
if (client.connected()) {
Expand Down Expand Up @@ -125,6 +131,6 @@ void loop() {
yield();

Serial.printf("\n\n");
Serial.printf("Default SSL: %d bytes used\n", a);
Serial.printf("1024 byte MFLN SSL: %d bytes used\n", b);
Serial.printf("Default SSL: %d bytes used\n", a);
Serial.printf("512 byte MFLN SSL: %d bytes used\n", b);
}