From 24310f73209b97dd805d09dcaa504d02740d1c23 Mon Sep 17 00:00:00 2001
From: Andrii Pientsov <andrii.pientsov@globallogic.com>
Date: Thu, 13 Feb 2020 15:59:34 +0200
Subject: Commands CREG, CGREG and CEREG should be utilized to get registered
 status

---
 src/MTS_IO_CellularRadio.cpp | 80 ++++++++++++++++++++++++++++++++------------
 1 file changed, 59 insertions(+), 21 deletions(-)

(limited to 'src/MTS_IO_CellularRadio.cpp')

diff --git a/src/MTS_IO_CellularRadio.cpp b/src/MTS_IO_CellularRadio.cpp
index 6f45da4..8bdd00e 100644
--- a/src/MTS_IO_CellularRadio.cpp
+++ b/src/MTS_IO_CellularRadio.cpp
@@ -736,41 +736,79 @@ void CellularRadio::initMipProfile(Json::Value& jData) {
     jData[ICellularRadio::KEY_MIP_MNHASS] = false;
 }
 
-ICellularRadio::CODE CellularRadio::getRegistration(REGISTRATION& eRegistration) {
-    std::string sCmd;
-    std::string sResp;
-
-    // LE910C1-NS is an LE910, so we stop the scan after the 0.
-    // NOTE: Eventually this may need to be changed to try all three of CREG, CGREG, and CEREG
-    if ((m_sName.find("LE910") != std::string::npos) || (m_sName.find("ME910") != std::string::npos)) {
-        // use AT+CGREG instead for LE910 models
-        sCmd = "AT+CGREG?";
-        sResp = "+CGREG: ";
-    }
-    else {
-        sCmd = "AT+CREG?";
-        sResp = "+CREG: ";
+const std::vector<std::string> CellularRadio::getRegistrationCommands() {
+    std::string sType;
+    convertModelToType(getName(), sType);
+
+    if (sType == VALUE_TYPE_LTE) {
+        return { "CREG", "CGREG", "CEREG" };
+    } else {
+        return { "CREG", "CGREG" };
     }
+}
+
+ICellularRadio::REGISTRATION CellularRadio::parseRegResponse(std::string sResult) {
+    size_t start = sResult.find(',');
+    size_t stop = sResult.find(' ', start);
+    std::string sRegStat = sResult.substr(start + 1, stop - start - 1);
+    int32_t value;
+    sscanf(sRegStat.c_str(), "%d", &value);
 
+    return (ICellularRadio::REGISTRATION)value;
+}
+
+ICellularRadio::CODE CellularRadio::getRegistration(REGISTRATION& eRegistration, const std::string& sType) {
+    std::string sCmd = "AT+" + sType + "?";
+    std::string sResp = "+" + sType + ": ";
     std::string sResult = sendCommand(sCmd, DEFAULT_BAIL_STRINGS, 5000);
     if (sResult.find(sResp) == std::string::npos) {
         if(sResult.size() == 0) {
-            printDebug("%s| Registration command returned no response: [%s]", m_sName.c_str());
+            printDebug("%s| Registration command returned no response", m_sName.c_str());
             return NO_RESPONSE;
         }
         printDebug("%s| Registration command returned unexpected response: [%s]", m_sName.c_str(), sResult.c_str());
         return FAILURE;
     }
 
-    size_t start = sResult.find(',');
-    size_t stop = sResult.find(' ', start);
-    std::string sRegStat = sResult.substr(start + 1, stop - start - 1);
-    int32_t value;
-    sscanf(sRegStat.c_str(), "%d", &value);
-    eRegistration = (REGISTRATION)value;
+    eRegistration = parseRegResponse(sResult);
     return SUCCESS;
 }
 
+ICellularRadio::CODE CellularRadio::getRegistration(REGISTRATION& eRegistration) {
+    /* REGISTRATION_PRIORITY:
+     *   REGISTERED     = 0
+     *   ROAMING        = 1
+     *   DENIED         = 2
+     *   SEARCHING      = 3
+     *   NOT_REGISTERED = 4
+     *   UNKNOWN        = 5
+     */
+    uint8_t uRegPriority[] = { 4, 0, 3, 2, 5, 1 };
+    ICellularRadio::CODE ret = ERROR;
+    REGISTRATION eReg = UNKNOWN;
+    eRegistration = UNKNOWN;
+
+    // We need to check CREG, CGREG, and CEREG for possible success.
+    // Depending on the radio, carrier, roaming, sim card, cellular mode and some other factors the registration
+    // will come back differently depending on the type of connection that is possible.
+
+    const auto & commands = getRegistrationCommands();
+    for (const auto & cmd : commands) {
+        ret = getRegistration(eReg, cmd);
+        if (ret != SUCCESS) {
+            break;
+        }
+
+        if (eReg == REGISTERED || eReg == ROAMING) {
+            eRegistration = eReg;
+            break;
+        }
+        eRegistration = (uRegPriority[eRegistration] > uRegPriority[eReg]) ? eReg : eRegistration;
+    }
+
+    return ret;
+}
+
 ICellularRadio::CODE CellularRadio::getCellularMode(CELLULAR_MODES &networks) {
     networks = CELLULAR_MODE_NA;
     std::string cmdResult = sendCommand("AT+COPS?");
-- 
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