refactor: drop unused radio API

Transceiver::flushTx() had no caller; suspendTx() is the only flush.
RadioScheduler::hasRoom() was only ever asked about a normal job, so it no
longer takes a priority flag.  The tests check the reserved stop slots
through submit() instead.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/RadioScheduler.cpp

@@ -43,8 +43,8 @@ uint32_t RadioScheduler::submit(somfy_tx_job_t &job, bool priority, uint16_t del
   this->count++;
   return job.seq;
 }
-bool RadioScheduler::hasRoom(bool priority) const {
-  return !this->suspendMask && admits(TX_JOB_QUEUE_SIZE - this->count, priority) && this->outcomesFit();
+bool RadioScheduler::hasRoom() const {
+  return !this->suspendMask && admits(TX_JOB_QUEUE_SIZE - this->count, false) && this->outcomesFit();
 }
 bool RadioScheduler::outcomesFit() const {
   // Each job not yet ended reports at most two outcomes: started, then how it

src/RadioScheduler.h

@@ -26,8 +26,8 @@ class RadioScheduler {
     // delayMs after it was queued and after the job ahead of it ended, and holds
     // up the jobs queued behind it.
     uint32_t submit(somfy_tx_job_t &job, bool priority, uint16_t delayMs, uint32_t now);
-    // Whether a job would be taken right now.
-    bool hasRoom(bool priority) const;
+    // Whether a normal (not priority) job would be taken right now.
+    bool hasRoom() const;
     // For the radio task: takes the job to send next.  False when there is
     // none due, waitMs then says how long until there is (RADIO_WAIT_FOREVER
     // when nothing waits).  A job taken goes on air through start() and

src/Somfy.cpp

@@ -4660,15 +4660,7 @@ bool Transceiver::txHasRoom() {
   // Without a radio task submitTx() fails straight away so there is no point waiting.
   if(!txTaskHandle) return true;
   TxQueueLock lock;
-  return this->sched.hasRoom(false);
-}
-void Transceiver::flushTx() {
-  {
-    TxQueueLock lock;
-    this->sched.flush(millis());
-  }
-  // Stop waiting on a delayed job that is gone.
-  if(txTaskHandle) xTaskNotifyGive(txTaskHandle);
+  return this->sched.hasRoom();
 }
 void Transceiver::suspendTx(uint8_t reason) {
   {
@@ -4742,7 +4734,7 @@ void Transceiver::txTask(void *arg) {
       haveJob = trans->sched.next(millis(), job, waitMs);
     }
     if(haveJob) trans->runJob(job);
-    // submitTx() and flushTx() wake us for a new job or a flush.
+    // submitTx() and suspendTx() wake us for a new job or a flush.
     else ulTaskNotifyTake(pdTRUE, waitMs == RADIO_WAIT_FOREVER ? portMAX_DELAY : pdMS_TO_TICKS(waitMs) + 1);
   }
 }

src/Somfy.h

@@ -462,7 +462,6 @@ class Transceiver {
     // Hands a job to the radio task, see RadioScheduler::submit().  Returns its
     // ticket, 0 when the radio can't take it.  Safe from any task.
     uint32_t submitTx(somfy_tx_job_t &job, bool priority = false, uint16_t delayMs = 0);
-    void flushTx();
     void suspendTx(uint8_t reason);
     void resumeTx(uint8_t reason);
     bool txSuspended();