nRF9160: Download client¶
The Download client sample demonstrates how to download a file from an HTTP or a CoAP server, with optional TLS or DTLS. It uses the Download client library.
The sample supports the following development kit:
The sample is configured to compile and run as a non-secure application on nRF91’s Cortex-M33. Therefore, it automatically includes the Secure Partition Manager that prepares the required peripherals to be available for the application.
You can also configure it to use TF-M instead of Secure Partition Manager.
The sample first initializes the Modem library and AT communications. Next, it provisions a certificate to the modem using the Modem key management library if the CONFIG_SAMPLE_SECURE_SOCKET option is set. The provisioning of the certificates must be done before connecting to the LTE network since the certificates can only be provisioned when the device is not connected. The certificate file name and security tag can be configured using the CONFIG_SAMPLE_SEC_TAG and the CONFIG_SAMPLE_CERT_FILE options, respectively.
The sample then performs the following actions:
Establishes a connection to the LTE network
Optionally sets up the secure socket options
Uses the Download client library to download a file from an HTTP server.
When the CONFIG_SAMPLE_SECURE_SOCKET option is set, the sample provisions the certificate found in the
The certificate file name is indicated by the CONFIG_SAMPLE_CERT_FILE option.
This certificate will work for the default test files.
If you are using a custom download test file, you must provision the correct certificate for the servers from which the certificates will be downloaded.
See Certificates for more information.
See Configuring your application for information about how to permanently or temporarily change the configuration.
Check and configure the following configuration options for the sample:
- CONFIG_SAMPLE_SECURE_SOCKET - Secure socket configuration
If enabled, this option provisions the certificate to the modem.
- CONFIG_SAMPLE_SEC_TAG - Security tag configuration
This option configures the security tag.
- CONFIG_SAMPLE_CERT_FILE - Certificate file name configuration
This option sets the certificate file name.
- CONFIG_SAMPLE_COMPUTE_HASH - Hash compute configuration
If enabled, this option computes the SHA256 hash of the downloaded file.
- CONFIG_SAMPLE_COMPARE_HASH - Hash compare configuration
If enabled, this option compares the hash against the SHA256 hash set by CONFIG_SAMPLE_SHA256_HASH for a match.
- CONFIG_SAMPLE_SHA256_HASH - Hash configuration
This option sets the SHA256 hash to be compared with CONFIG_SAMPLE_COMPUTE_HASH.
This sample can be found under
samples/nrf9160/download in the nRF Connect SDK folder structure.
The sample is built as a non-secure firmware image for the nrf9160dk_nrf9160_ns build target. Because of this, it automatically includes the Secure Partition Manager. You can also configure it to use TF-M instead of SPM.
See Building and programming an application for information about how to build and program the application.
After programming the sample to your development kit, test it by performing the following steps:
Connect the development kit to your PC using a USB cable and power on or reset the kit.
Open a terminal emulator and observe that the sample starts, provisions certificates, and starts to download.
Observe that the progress bar fills up as the download progresses.
Observe that the sample displays the message “Download completed” on the terminal when the download completes.
The following output is logged on the terminal when the sample downloads a file from an HTTPS server:
Download client sample started Provisioning certificate Waiting for network.. OK Downloading https://file-examples-com.github.io/uploads/2017/10/file_example_JPG_100kB.jpg [ 100% ] |==================================================| (102117/102117 bytes) Download completed in 13302 ms @ 7676 bytes per sec, total 102117 bytes Bye