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61	61	[[image:new-device-check-connectivity.png||height="522" width="500"]]
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64		-On the terminal, enter the command you copied. This command sends the MQTT payload **{temperature:25}** as telemetry data from a virtual device named **'me'**. Of course, you can replace **'me'** with a device name or use the wildcard character **'+'** to match any device name.
	64	+On the terminal, enter the command you copied. This command sends the MQTT payload **{temperature:25}** as telemetry data from a virtual device named **'me'**.
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67	67	[[image:mqtt-command-1.png||height="228" width="700"]]
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70		-If the command is successful, you can see the telemetry data you sent under the **Latest telemetry** section.
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73	73	[[image:new-device-telemetry-test.png||height="520" width="500"]]
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76		-Send the same command again, only changing the **temperature** value, to see how the **Latest telemetry** section updates its data.
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78		-Once you are done experimenting with this, close the window by clicking the **Close** button.
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81		-[[image:mqtt-command-2.png||height="227" width="700"]]
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84	84	= Data Converters =
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86	86	In **ThingsBoard**, **Data Converters** are components used to transform incoming or outgoing data between different formats, typically to convert raw telemetry data from devices into a structured format that ThingsBoard can understand, or vice versa.