From 02bc7ab49a75fc028abf9bc2aeeba4e65e9849b6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jordi=20Altay=C3=B3?= <jordialtayo@gmail.com>
Date: Thu, 26 Dec 2019 20:37:14 +0100
Subject: [PATCH] added `CNMI` command to init function

I had problems when using the `CMGL` command and it wouldn't reply with any message in the buffer, adding the CNMI configuration in the init solved the issue for me
---
 GPRS_Shield_Arduino.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/GPRS_Shield_Arduino.cpp b/GPRS_Shield_Arduino.cpp
index 126ce0a..ba4d696 100644
--- a/GPRS_Shield_Arduino.cpp
+++ b/GPRS_Shield_Arduino.cpp
@@ -56,6 +56,11 @@ bool GPRS::init(void)
     }
     //delay(500);	It is not necessary, as we have time before next command
     
+    // set New Message Indicator
+    if(!sim900_check_with_cmd(F("AT+CNMI=1,1,0,0,0\r\n"), "OK\r\n", CMD)) { // Set message mode to ASCII
+        return false;
+    }
+	
     if(!checkSIMStatus()) {
 		return false;
     }