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I'm trying to implement a Substrate client on IoT, to send a basic extrinsic that stores as an example, a key-value. This code needs to run on ARM or ESP32 kinds of chips.

Are there any suggestions on which library to use?

The polkadot_api_cpp is too old because it supports only up to substrate metadata V7. Also, I've tried to no_std the Rust substrate-api-client library without success.

I'm considering building a C client to build/send a transaction to Substrate, but I really wanna be sure that there's no alternative.

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    I'm not familiar with subxt enough to know how feasible no_std support is, but there's an old issue for it github.com/paritytech/subxt/issues/159. Maybe you could chime in there. The hard part about creating a substrate client is that it needs to be "dynamic" in order to be useful long-term, i.e. it most generate its API based on substrate's chain metadata. This might also be of interest to you: cyrilfougeray.com/2020/12/14/leger-rust-wallet-1.html
    – André
    Feb 25, 2022 at 16:00
  • try the go-substrate-rpc-client, it's platform-independent. Feb 25, 2022 at 16:06
  • @André Thanks for the issue link ! I'm aware that the client has to have this "dynamic" structure (using metadata) to adapt the new futur chain spec. My goal is to first have a strictly (chain) specific implementation first, but maybe that isn't best idea ? It's a shame Rust/Substrate makes it difficult to target IoT.
    – lucgerrits
    Feb 25, 2022 at 16:19
  • @ChinoChang Thanks for the tip, unfortunately I've no experience in Go...
    – lucgerrits
    Feb 25, 2022 at 16:19

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I think making subxt be no std compatible would seem to be the best way to go. https://github.com/paritytech/subxt/issues/208

No one has yet given it a crack with a PR, but all the on chain code is no_std so it's probably doable. (There are a few other IOT parachain/threads so maybe check with them too - https://parachains.info/details/nodle_iot and https://www.radom.network/ )

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