# v0.7.1 — `sendlnretry`: stop losing commands to a booting device

## 🐛 Bug fixes

**Scripts no longer hang forever when a device swallows a command**
* A device that is still booting can silently **discard console input** the moment its shell takes over the tty. The line you sent is gone — the device never echoes it and never runs it — so the `wait` that follows blocks forever and your test rig sits dead until someone notices.
* This is a race, not a delay: adding `pause` before `sendln` only lowers the odds of hitting the window, it can never close it. In a 45-cycle overnight power-cycle run, 3 cycles hung this way — and the sends that got swallowed landed at *exactly* the same moment as the ones that worked.

## ✨ New features

**New TTL command: `sendlnretry`**
```
sendlnretry '<text>' '<confirm keyword>' [max attempts]
```
* Sends the text, then **waits for proof the device actually ran it** — and **resends** if that proof doesn't arrive. Omit the attempt count and it retries until it gets through.
* On success `result = 1`. If it runs out of attempts, `result = 0` and **the script keeps going**, so you can handle it yourself:

```
wait 'root@(none):/#'
sendlnretry 'tpm2' 'TPM 2p0'      ; retry until the DUT really runs it
wait 'PASS'

sendlnretry 'tpm2' 'TPM 2p0' 3    ; or cap it and handle failure
if result = 0 then
    dispstr 'tpm2 got no response after 3 tries'
endif
```

* Pick a confirm keyword from the command's **output** (`TPM 2p0`), not its echo (`tpm2`) — a tty echo comes from the kernel and doesn't prove the shell ever read the line.
* Each send clears the receive buffer first, so a match can only come from *this* send; on a hit it consumes only up to the **first** occurrence, leaving the rest for your next `wait`.
* Per-attempt timeout follows `timeout` / `mtimeout` if you set them, otherwise **3 seconds**. (Unlike `wait`, `0` doesn't mean "wait forever" here — that would mean never retrying.)

Full command reference: [TTL Script Reference → 送出並確認](https://github.com/ETWen/ETTerms/blob/main/docs/ttl-script-reference.md#送出並確認sendlnretry)

## 📦 Downloads

| Build | Needs .NET Runtime? | Notes |
|---|---|---|
| **ETTerms_v0.7.1** (Standard) | ✅ Requires .NET 8 Desktop Runtime | Smaller download |
| **ETTerms_v0.7.1_portable** (Portable) | ❌ Runtime included | Unzip and run anywhere, no admin |

Run `ETTerms v0.7.1.exe`.

## 🔗 Links

* [TTL script reference](https://github.com/ETWen/ETTerms/blob/main/docs/ttl-script-reference.md)
* [Architecture](https://github.com/ETWen/ETTerms/blob/main/ARCHITECTURE.md)

**Full changelog:** [v0.7.0...v0.7.1](https://github.com/ETWen/ETTerms/compare/v0.7.0...v0.7.1)