Fix: catch OSError/ConnectionError in Modbus service read path - #77
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The async_read_entity() method (service-call path) only caught ModbusIOException but client.read() can also raise OSError and ConnectionError on network failures. This caused unhandled exceptions when using the read_register service with unreachable devices. The bulk-read path (_auto_detect_type, _direct_read) already handled these correctly — only the service path was missed. https://claude.ai/code/session_0141XkQRjcng4RKLD4Yv5FAr
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The async_read_entity() method (service-call path) only caught ModbusIOException but client.read() can also raise OSError and ConnectionError on network failures. This caused unhandled exceptions when using the read_register service with unreachable devices.
The bulk-read path (_auto_detect_type, _direct_read) already handled these correctly — only the service path was missed.
https://claude.ai/code/session_0141XkQRjcng4RKLD4Yv5FAr