Fix checkValid function

Diff target needs to be converted to little endian for comparison.

src/mining.cpp

@@ -346,16 +346,12 @@ void runMiner(void * task_id) {
       }
       shares++;
 
-        // check if valid header
+      // check if valid header
       if(checkValid(hash, mMiner.bytearray_target)){
         Serial.printf("[WORKER] %d CONGRATULATIONS! Valid block found with nonce: %d | 0x%x\n", miner_id, nonce, nonce);
         valids++;
         Serial.printf("[WORKER]  %d  Submitted work valid!\n", miner_id);
-        // STEP 3: Submit mining job
-        tx_mining_submit(client, mWorker, mJob, nonce);
-        client.stop();
-        // exit 
-        nonce = MAX_NONCE;
+        // wait for new job
         break;
       }
       // increment nonce

src/utils.cpp

@@ -113,15 +113,18 @@ double diff_from_target(void *target)
 
 bool checkValid(unsigned char* hash, unsigned char* target) {
   bool valid = true;
+  unsigned char diff_target[32];
+  memcpy(diff_target, &target, 32);
+  //convert target to little endian for comparison
+  reverse_bytes(diff_target, 32);
+
   for(uint8_t i=31; i>=0; i--) {
-    if(hash[i] > target[i]) {
+    if(hash[i] > diff_target[i]) {
       valid = false;
       break;
-    } else if (hash[i] < target[i]) {
-      valid = true;
-      break;
     }
   }
+
   #ifdef DEBUG_MINING
   if (valid) {
     Serial.print("\tvalid : ");