set diff if it isn't suggested

src/models/StratumV1Client.ts

@@ -219,6 +219,11 @@ export class StratumV1Client extends EasyUnsubscribe {
             && this.clientAuthorization != null
             && this.stratumInitialized == false) {
 
+            if (this.clientSuggestedDifficulty == null) {
+                const setDifficulty = JSON.stringify(new SuggestDifficulty().response(this.sessionDifficulty));
+                this.socket.write(setDifficulty + '\n')
+            }
+
             this.stratumInitialized = true;
 
             this.entity = await this.clientService.save({

src/models/stratum-messages/StratumBaseMessage.ts

@@ -4,7 +4,7 @@ import { eRequestMethod } from '../enums/eRequestMethod';
 
 export class StratumBaseMessage {
     @IsNumber()
-    id: number;
+    id?: number = null;
     @IsEnum(eRequestMethod)
     method: eRequestMethod;
 }

src/models/stratum-messages/SubscriptionMessage.ts

@@ -20,8 +20,7 @@ export class SubscriptionMessage extends StratumBaseMessage {
             error: null,
             result: [
                 [
-                    ['mining.set_difficulty', '731ec5e0649606ff'],
+                    ['mining.notify', clientId]
-                    ['mining.notify', '731ec5e0649606ff']
                 ],
                 clientId, //Extranonce1 -  Hex-encoded, per-connection unique string which will be used for coinbase serialization later. Keep it safe!
                 4 //Extranonce2_size - Represents expected length of extranonce2 which will be generated by the miner.