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Accept wildcards in mqtt subscription prefix #1497

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e9446b2
Accept wildcards in mqtt subscription prefix
cvdenzen Aug 16, 2021
45cb263
Accept wildcards in mqtt subscription prefix
cvdenzen Aug 18, 2021
b36c846
Accept wildcards in mqtt subscription prefix
cvdenzen Aug 18, 2021
aeb62d2
Merge remote-tracking branch 'origin/carl' into carl
cvdenzen Aug 22, 2021
4a8bb44
Merge remote-tracking branch 'origin/carl' into carl
cvdenzen Aug 22, 2021
75e131b
Merge remote-tracking branch 'origin/carl' into carl
cvdenzen Aug 22, 2021
23eb210
Merge remote-tracking branch 'origin/carl' into carl
cvdenzen Aug 22, 2021
305992b
Merge branch 'carl' of https://github.com/cvdenzen/MySensors into carl
cvdenzen Aug 22, 2021
2cfe833
Bug fix for GPIO under recent Linux kernel versions
romaricr Mar 12, 2024
3dba00f
Updated for style and minors non functional changes
romaricr Mar 16, 2024
f157ed0
Minor changes
romaricr Mar 16, 2024
72f713a
Merge branch 'development' into carl
cvdenzen Mar 24, 2024
fea7b0d
Makefile.inc under version control
cvdenzen Mar 24, 2024
80987aa
Merge remote-tracking branch 'upstream2/gpio_fix' into carl
cvdenzen Jan 18, 2025
29ecc91
GPIO issues
cvdenzen Jan 30, 2025
55ab7b5
Revert "GPIO issues"
cvdenzen Feb 4, 2025
6f42fbf
GPIO issue 1567
cvdenzen Feb 4, 2025
031957d
Revert "Minor changes"
cvdenzen Feb 4, 2025
3d47095
Revert "Updated for style and minors non functional changes"
cvdenzen Feb 4, 2025
76beb1f
Revert "Bug fix for GPIO under recent Linux kernel versions"
cvdenzen Feb 4, 2025
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9 changes: 9 additions & 0 deletions MySensors-Arduino.iml
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Original file line number Diff line number Diff line change
@@ -0,0 +1,9 @@
<?xml version="1.0" encoding="UTF-8"?>
<module type="JAVA_MODULE" version="4">
<component name="NewModuleRootManager">
<output url="file://$MODULE_DIR$/bin" />
<exclude-output />
<content url="file://$MODULE_DIR$" />
<orderEntry type="sourceFolder" forTests="false" />
</component>
</module>
3 changes: 1 addition & 2 deletions configure
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Expand Up @@ -577,10 +577,9 @@ if [ -z "${SOC}" ]; then
info=($(detect_machine))
SOC=${info[0]}
TYPE=${info[1]}
CPU=${info[2]}
printf " ${OK} machine detected: SoC=${SOC}, Type=${TYPE}, CPU=${CPU}.\n"
fi

CPU=$(eval "uname -m 2>/dev/null")
if [ -z "${CPUFLAGS}" ]; then
CPUFLAGS=$(gcc_cpu_flags "${SOC}" "${CPU}")
fi
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23 changes: 19 additions & 4 deletions core/MyProtocol.cpp
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Expand Up @@ -111,14 +111,29 @@ bool protocolMQTT2MyMessage(MyMessage &message, char *topic, uint8_t *payload,
const unsigned int length)
{
char *str, *p;
uint8_t index = 0;
int8_t index = -1;
message.setSender(GATEWAY_ADDRESS);
message.setLast(GATEWAY_ADDRESS);
message.setEcho(false);
for (str = strtok_r(topic + strlen(MY_MQTT_SUBSCRIBE_TOPIC_PREFIX) + 1, "/", &p);

// The subscription prefix can contain wildcards, but only the + wildcard.
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@Yveaux Yveaux Aug 22, 2021 •
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Why is only the single-level + wildcard supported?
If we add support for wildcards, users will expect to be able to use multi-level # wildcards too.
If you parse right-to-left for the mysensors message field you could support any wildcard.
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The MQTT multi-level wildcard (#) is only allowed at the end of the topic. Because the prefix is always followed by other levels it cannot contain the # wildcard, although "my" code wouldn't complain about it.

The code only checks the number of / characters.
The syntactical check is left to the MQTT broker. That was already the case and I think that is right. I have browsed the MySensors code and checked all code where the PREFIX is used and none of needed a change.
// e.g. subscription prefix "+/mysensors", actual prefix "foo/mysensors"
// To fetch only the part after the mqtt prefix, discard as many
// mqtt levels (between / characters) as in the subscription prefix.
// Make a copy of the subscribe prefix because strtok is allowed to change the string.
char subscribeTopicPrefix[strlen(MY_MQTT_SUBSCRIBE_TOPIC_PREFIX) + 1];
strcpy(subscribeTopicPrefix,MY_MQTT_SUBSCRIBE_TOPIC_PREFIX);
char *strPrefix, *savePointerPrefix;
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What's the increase in ram/flash for this change?
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The savepointer (4 bytes?) is stored on stack I guess.
The increase in ram (stack use?) for the copy of the prefix string will be the length of the prefix plus 1.
The default value for the prefix is mygateway1-in, length is 13, so it will use 14 bytes on the stack. Your comment made me think about this memory usage. Actually I think malloc/free would be safer. Or maybe choose in runtime between stack and malloc depending on the prefix length? The length of the string is known at compile time, but I don't think that will help. I am not an expert in this subject.

Flash use? Is that the code length? The answer is: I don't know.

I compiled and ran it only on a raspberry pi 2, not on an Arduino.
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In core/MyGatewayTransportMQTTClient.cpp, method reconnectMQTT, there is also a local variable inTopic with a length of the prefix plus 10. So I think it is acceptable to have it as a stack variable.
for (str = strtok_r(topic, "/", &p),
strPrefix = strtok_r(subscribeTopicPrefix,"/", &savePointerPrefix);
str && index < 5;
str = strtok_r(NULL, "/", &p), index++
str = strtok_r(NULL, "/", &p),
strPrefix = strtok_r(NULL, "/", &savePointerPrefix)
) {
// Increment index (init value is -1) if we have consumed the mqtt subscription prefix
if (!strPrefix) {
index++;
}
switch (index) {
case 0:
// Node id
Expand Down Expand Up @@ -163,5 +178,5 @@ bool protocolMQTT2MyMessage(MyMessage &message, char *topic, uint8_t *payload,
}
}
// Return true if input valid
return (index == 5);
return (index == 4);
}