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docs: clarify MQTT password-based authentication credentials #1285

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docs: clarify MQTT password-based authentication credentials
google-labs-jules[bot] Apr 8, 2026
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docs: clarify MQTT password-based authentication credentials
google-labs-jules[bot] Apr 8, 2026
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docs: clarify MQTT password-based authentication credentials
google-labs-jules[bot] Apr 8, 2026
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docs: clarify MQTT password-based authentication credentials
google-labs-jules[bot] Apr 8, 2026
c932858
docs: clarify MQTT password-based authentication credentials
google-labs-jules[bot] Apr 8, 2026
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docs: clarify MQTT authentication credentials
google-labs-jules[bot] Apr 9, 2026
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1 change: 1 addition & 0 deletions .wordlist.txt
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Expand Up @@ -104,6 +104,7 @@ macos
md
microservices
modbus
Mosquitto
MQTT
mydomain
namespace
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6 changes: 5 additions & 1 deletion docs/specs/mqtt_client.md
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Expand Up @@ -6,4 +6,8 @@

The client should implement exponential backoff in the event of a loss of connection to the broker
up to a maximum interval period of 120 seconds between connection attempts, and then should continue
connection attempts indefinitely.
connection attempts indefinitely.

## Authentication

When using client certificates for authentication (which is the current typical configuration), password-based authentication is not used. In these cases, the `username` may still be passed as `/r/<registry_id>/d/<device_id>` depending on the backend, but the MQTT broker (e.g., Mosquitto) does not validate passwords.
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