initializing argument 2 of 'bool MQTT::publish(const char*, const uint8_t*, unsigned int)' [-fpermissive] about mqtt HOT 7 CLOSED

maybe like following.

// client.publish("rayterrill/feeds/moisture",(uint8_t)sensorValue,4);
client.publish("rayterrill/feeds/moisture",(uint8_t *)&sensorValue, sizeof(sensorValue));

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I'm still getting garbage even with that code.

I looked at the Adafruit MQTT library, and they've got a publish declaration that allow for an int value, as in this:
bool Adafruit_MQTT_Publish::publish(int32_t i) { char payload[12]; ltoa(i, payload, 10); return mqtt->publish(topic, payload, qos); }

I incorporated some similar char coercing logic into my publish, and I'm indeed now able to publish data using this libraries char publish declaration. I just can't get it to work at all with the unit8_t declaration.

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Do you want to use char or int type in publish? If you want to use char, you can do like this.

char publishData[120];
sprintf(publishData, "%d", 10);
client.publish("rayterrill/feeds/moisture", publishData, strlen(publishData));

or If you want to use int type. of course you should get published data with int type.

  client.publish("rayterrill/feeds/moisture",(uint8_t *)&sensorValue, sizeof(sensorValue));

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I tried it with:
client.publish("rayterrill/feeds/moisture",(uint8_t *)&sensorValue, sizeof(sensorValue));

Still getting garbage data into Arduino IO. It might just be Arduino IO, not sure.

I wanted to post as int, but char is also working.

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here is my test code.

// photon side
int sensorValue = 65; // character 'A'
void loop() {
    if (client.isConnected())
        client.loop();
    delay(1000);
    client.publish("sensor/val/", (uint8_t *)&sensorValue, sizeof(sensorValue));
    sensorValue++;
}

// mosquitto side
mosquitto_sub  -h [mosquitt_server_ipaddr] -t "sensor/val/"
A
B
C
D
E
F
...

I check works well on my Photon/mosquitto command. Check your Arduino IO side source code.

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Hi @rayterrill , can you work on Photon with MQTT? I will close this issue.

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Sure. Go ahead and close. Thanks for the help!

On Sun, Aug 28, 2016 at 9:41 PM -0700, "Hirotaka" [email protected] wrote:

Hi @rayterrill , can you work on Photon with MQTT? I will close this issue.

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