# No answer from node

If S2GW do not receive answers from a node over radio during initialisation or when it collects the readings then it informs B3 about lack of communication with node. 

The reasons can be the node is switched off, faulty, out of range or has incorrect Group ID or Node ID.

Radio communication log

```clike
[07/06/2024 10:05:20:501] [S2Sensor 3_1 : Sending] 09 11 3C 05 01 03 0E 01 45 
[07/06/2024 10:05:20:504] [S2Sensor 3_1 : Receiving] 
[07/06/2024 10:05:20:505] [S2Sensor 3_1] No reply from sensor, Returning null
```

Part of POST to B3

```xml
[05/06/2024 13:46:21:437] [S2Gateway] Sending xml:
<?xml version="1.0" encoding="UTF-8"?>
<NodeServer>
  <MacAddress>b8:27:eb:c7:38:d9</MacAddress>
  <Status>Error</Status>
  <ErrorCode>1</ErrorCode>
  <ErrorMsg>No communication with node</ErrorMsg>
  <ErrorMsg>5:1:6_0</ErrorMsg>
</NodeServer>
```