zephyr: hello_nrf91_offloaded: document hexstring

Clarify how sending credentials to the nrf91 modem: - Add double quotes around PSK-ID and PSK - Add sample command to illustrate how to hex-encode an ASCII string Signed-off-by: Mike Szczys <[email protected]>
golioth · Jan 24, 2025 · 2f80462 · 2f80462
1 parent 81bb59b
commit 2f80462
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diff --git a/examples/zephyr/hello_nrf91_offloaded/README.md b/examples/zephyr/hello_nrf91_offloaded/README.md
@@ -53,6 +53,14 @@ AT%CMNG=0,515765868,4,my-psk-id
 AT%CMNG=0,515765868,3,my-psk-encoded-as-hexstring
 ```
 
+Note: the PSK *must* be encoded as hexadecimal values. One way to
+convert your ASCII-encoded PSK is to use the following Linux command:
+
+```
+$ echo "my-golioth-psk" | tr -d '\n' | xxd -ps -c 200
+6d792d676f6c696f74682d70736b
+```
+
 ##### Using `nrf_modem_at` application specific shell command
 
 This application comes with `nrf_modem_at` Zephyr shell command. It can