ESP8266 Community Forum

Posted: **Sun May 30, 2021 11:55 am**

I've got mosquitto_sub running on a couple linux boxes on my network, and I'm compiling the example that comes with the ESP8266_RTOS_SDK examples in the mqtt section (ws & tcp). The 'Example Configuration' section of the menuconfig defaults to some cloud mqtt url but I want it to use the mosquitto broker running on one of my linux boxes. So I specify the broker url as 192.168.88.150 which works with mosquitto, but when I compile and flash the ESP8266 is says:

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Error parse uri: = 192.168.88.150
Client asked to stop, but was not started
Client was not initialized

I also had to hard code in setting the port number because I couldn't find where to set it in the menuconfig.
I'm digging threw the code right now in components/mqtt/esp-mqtt/mqtt_client.c but I don't want to go mucking around with it by hard-coding it in. Do I need to specify a DNS name for the linux box?

Posted: **Tue Jun 01, 2021 3:30 am**

I checked out that example some time ago

I'm using mosquitto too, so I went straight to the code and changed it like the following

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     const esp_mqtt_client_config_t mqtt_cfg = {
        // .uri = "mqtts://mqtt.eclipse.org:8883",
        // .uri = CONFIG_BROKER_URI,
        .host = "192.168.88.50",
        .port = 1883,
        .transport = MQTT_TRANSPORT_OVER_SSL,

but I think you can get the same result setting your BROKER_URI to

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mqtts://192.168.88.150:1883

Posted: **Tue Jun 01, 2021 5:57 am**

on second thought this is probably what you were looking for...

you can also change the file Kconfig.projbuild
and have your host and port configurable by menuconfig

Kconfig.projbuild

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...
config BROKER_HOST
        string "Broker HOST"
        default "192.168.1.100"
        help
            The mqtt broker IP address.

config BROKER_PORT
        int "Broker PORT"
        default 1883
        help
            The mqtt broker port.
...

and then into the code

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const esp_mqtt_client_config_t mqtt_cfg = {
        // .uri = CONFIG_BROKER_URI,
        .host = CONFIG_BROKER_HOST,
        .port = CONFIG_BROKER_PORT,

Posted: **Tue Jun 01, 2021 5:18 pm**

I think you meant BROKER_URL but yeah, that worked!
Many thanks, I owe you dinner at the very least.

ESP8266 Community Forum

how to set broker url in menuconfig for rtos mqtt example

how to set broker url in menuconfig for rtos mqtt example

Re: how to set broker url in menuconfig for rtos mqtt exampl

Re: how to set broker url in menuconfig for rtos mqtt exampl

Re: how to set broker url in menuconfig for rtos mqtt exampl