# Document history
<a name="elpg-history"></a>

The following table describes important changes to the AWS IoT ExpressLink Programmer's Guide starting with v1.0. We also update the documentation to address any errors found or feedback received.



| Change | Description | Date | 
| --- | --- | --- | 
| version 1.0 | Initial release. | June 20, 2022 | 
| version 1.1.1 | The following sections were added:+  [8 AWS IoT Services](elpg-iot-services.md) <br />The following sections and tables were updated:+  [3.3 Delimiters and escaping](elpg-commands.md#elpg-delimiters) <br />+  [3.4 Maximum values](elpg-commands.md#elpg-max-values) <br />+  [Table 1 - Error codes](elpg-commands.md#elpg-table1) <br />+  [3.7.2 CONNECT   »Establish a connection to an AWS IoT Core Endpoint«](elpg-commands.md#elpg-connect-command) <br />+  [3.7.7 FACTORY\_RESET   »Request a factory reset of the ExpressLink module«](elpg-commands.md#elpg-factory-reset-command) <br />+  [4.1.7 SUBSCRIBE*[\#]*   »Subscribe to Topic\#«](elpg-messaging.md#elpg-subscribeh-command) <br />+  [4.1.8 UNSUBSCRIBE*[\#]*   »Unsubscribe from Topic\#«](elpg-messaging.md#elpg-unsubscribeh-command) <br />+  [Table 2 - Configuration dictionary persistent keys](elpg-configuration-dictionary.md#elpg-table2.title) <br />+  [Table 3 - Configuration dictionary non-persistent keys](elpg-configuration-dictionary.md#elpg-table3) <br />+  [Table 4 - ExpressLink event codes](elpg-event-handling.md#elpg-table4) <br />+  [9 Provisioning](elpg-provisioning.md) <br />The following sections were removed:+  4.1.3 SEND *{topic} message*   »Publish msg on the specified topic« <br />+  6 Status dictionary <br />  note that subsequent sections were renumbered <br />+  9 Additional services  | November 17, 2022 |