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disaster-radio
A (paused) work-in-progress long-range, low-bandwidth wireless disaster recovery mesh network powered by the sun.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Perhaps checkout Meshtastic, it pretty much does what you want. https://meshtastic.org/
Also, the messages will be extremely slow. On the low end, 300 baud (if you are close enough, 37kbps, but there are laws preventing full usage in some countries.). Not enough to send pictures in a reasonable amount of time. See also https://disaster.radio/
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.