JKRhb
commented
1 year ago Hi @vincent-iQontrol, you are right, there is definitely room for improvement. What have you tried so far?
For connecting to a CoAP server via DTLS, you need to use a config with OpenSSL defined as the DTLS backend. A minimal example could look like the listing below. For this to work, you need to have libssl.so available somewhere (on Linux, it should work by default). On Android, you probably need to include a plugin that ships the OpenSSL binary and makes it available to the Flutter application.
Unfortunately, the dtls library is not maintained anymore and also has some issues at times. Therefore, this part of the CoAP library must be considered highly experimental (while the PSK/RPK features provided by dart_tinydtls are a lot more stable already).
I hope I was able to help – otherwise, let me know if you have any more questions/encounter any problems!
The promised example:
class DtlsConfig extends DefaultCoapConfig {
@override
final dtlsBackend = DtlsBackend.OpenSsl;
}
FutureOr<void> main() async {
final conf = DtlsConfig();
final uri = Uri(
scheme: 'coaps',
host: 'californium.eclipseprojects.io',
port: conf.defaultSecurePort,
);
final client = CoapClient(
uri,
config: conf,
);
try {
print('Sending get /test to ${uri.host}');
final response = await client.get('test');
print('/test response: ${response.payloadString}');
} on Exception catch (e) {
print('CoAP encountered an exception: $e');
}
client.close();
}
vincent-iQontrol
JosefWN
I need to connect to a coap server with a certificate X509 (secp256r1) There are 2 options: tinydtls and openssl. The readme is not sufficient enough to make it work.