[Azure_IoT_Central_ESP32] Failed decoding SAS key

[matsujirushi]

Describe the bug
"Failed decoding SAS key" occurs when trying individual enrollments of SAS with sample code Azure_IoT_Central_ESP32.

To Reproduce

1. Generate SAS Key with openssl rand -base64 64 command.
2. Set SAS Key to IOT_CONFIG_DEVICE_KEY

Expected behavior
The SAS Key generation command openssl rand -base64 64 uses what is written in the Azure IoT Central document.
I am generating a 64 byte key, but it seems that Azure_IoT_Central_ESP32 only supports up to 32 bytes.

I think you should increase ECODED_SAS_KEY_BUFFER_SIZE in the sample code to 64 or change the Azure IoT Central documentation.

Screenshots

Generate SAS key:

$ openssl rand -base64 64
JX5MSR2bjrEpY3siZjcMxaTDcZ//7OPjdmER024lETmj8mZVXHVMvHE/9ELwqomI
tb3TRkmTzdbHbe1ASsR6Lg==

Log:

1970/1/1 00:00:00 [INFO] Connecting to WIFI wifi_ssid seeed2g
..
1970/1/1 00:00:01 [INFO] WiFi connected, IP address: 192.168.1.106
1970/1/1 00:00:01 [INFO] Setting time using SNTP
......
2022/9/28 11:48:07 [INFO] Time initialized!
2022/9/28 11:48:07 [INFO] Azure IoT client initialized (state=2)
2022/9/28 11:48:07 [ERROR] Failed decoding SAS key.
2022/9/28 11:48:07 [ERROR] Failed creating mqtt password for DPS connection.
2022/9/28 11:48:07 [ERROR] Failed initializing MQTT client.
2022/9/28 11:48:07 [ERROR] Azure IoT client is in error state.

[ericwol-msft]

Yes, the default autogenerated keysize in IoT Central is 32 bytes, but also supports (and DPS) 64 byte device keys. Will update the sample with longer 64 byte key.

[matsujirushi]

Azure/azure-sdk-for-c-arduino#30

[ericwol-msft]

Issue resolved with Azure/azure-sdk-for-c-arduino#30