completed SMS gateway project

app/jobs/send_sms_job.rb

@@ -0,0 +1,41 @@
+class SendSmsJob < ApplicationJob
+  queue_as :default
+  retry_on StandardError, wait: :exponentially_longer, attempts: 3
+
+  def perform(sms_message_id)
+    sms = SmsMessage.find(sms_message_id)
+
+    # Skip if already sent or not outbound
+    return unless sms.outbound? && sms.status == "queued"
+
+    # Find available gateway
+    gateway = Gateway.available_for_sending
+
+    unless gateway
+      Rails.logger.warn("No available gateway for message #{sms.message_id}")
+      sms.update!(status: "pending")
+      # Retry later
+      SendSmsJob.set(wait: 1.minute).perform_later(sms_message_id)
+      return
+    end
+
+    # Update message status
+    sms.mark_sent!(gateway)
+
+    # Broadcast message to gateway via WebSocket
+    GatewayChannel.broadcast_to(gateway, {
+      action: "send_sms",
+      message_id: sms.message_id,
+      recipient: sms.phone_number,
+      message: sms.message_body
+    })
+
+    Rails.logger.info("Sent SMS #{sms.message_id} to gateway #{gateway.device_id}")
+  rescue ActiveRecord::RecordNotFound => e
+    Rails.logger.error("SMS message not found: #{e.message}")
+  rescue StandardError => e
+    Rails.logger.error("Failed to send SMS #{sms_message_id}: #{e.message}")
+    sms&.increment_retry!
+    raise
+  end
+end