Regression on payjoin-cli when using bitcoind with older versions.

[benalleng]

Trying to run the payjoin-cli with bitcoind v28.1.0 reported a failure to connect to the blockchain perhaps with a change with how the network is reading the api response for the json data itself.

rust-payjoin/payjoin-cli/src/app/wallet.rs

Lines 183 to 189 in 762fbaf

	pub fn network(&self) -> Result<Network> {
	tokio::task::block_in_place(|| {
	tokio::runtime::Handle::current().block_on(async { self.rpc.network().await })
	})
	.map_err(|_| anyhow!("Failed to get blockchain info"))
	}
	}

Failed when trying to read this data.

{"result":{"chain":"regtest","blocks":302,"headers":302,"bestblockhash":"5a559292d2b29230f309fddbb42
ef0e669ef2fa5c488a31ea2c95903a400f3e2","difficulty":4.656542373906925e-10,"time":1772738550,"mediant
ime":1772738549,"verificationprogress":1,"initialblockdownload":false,"chainwork":"00000000000000000
0000000000000000000000000000000000000000000025e","size_on_disk":91660,"pruned":false,"warnings":[]},
"error":null,"id":0}

with

Error: Failed to connect to bitcoind. Check config RPC connection.

Caused by:
    Failed to get blockchain info

upgrading to at least v29.0 or reverting back to baf60d4 fixed this problem

[DanGould]

Confirmed can reproduce, I kept hitting this the other week and wondered what was wrong.

tbf bitcoind-async-client documents this, we need to as well. I wonder if we can detect version and fail early w/ a useful message.