Cellular: Added CellularDevice::init_module API to be called at startup

features/cellular/easy_cellular/CellularConnectionFSM.cpp

@@ -394,8 +394,11 @@ void CellularConnectionFSM::state_power_on()
     }
 }
 
-void CellularConnectionFSM::device_ready()
+bool CellularConnectionFSM::device_ready()
 {
+    if (_cellularDevice->init_module(_serial) != NSAPI_ERROR_OK) {
+        return false;
+    }
     tr_info("Cellular device ready");
     if (_event_status_cb) {
         _event_status_cb((nsapi_event_t)CellularDeviceReady, 0);
@@ -403,14 +406,16 @@ void CellularConnectionFSM::device_ready()
     _power->remove_device_ready_urc_cb(mbed::callback(this, &CellularConnectionFSM::ready_urc_cb));
     _cellularDevice->close_power();
     _power = NULL;
+    return true;
 }
 
 void CellularConnectionFSM::state_device_ready()
 {
     _cellularDevice->set_timeout(TIMEOUT_POWER_ON);
     if (_power->set_at_mode() == NSAPI_ERROR_OK) {
-        device_ready();
+        if (device_ready()) {
-        enter_to_state(STATE_SIM_PIN);
+            enter_to_state(STATE_SIM_PIN);
+        }
     } else {
         if (_retry_count == 0) {
             (void)_power->set_device_ready_urc_cb(mbed::callback(this, &CellularConnectionFSM::ready_urc_cb));
@@ -658,9 +663,10 @@ void CellularConnectionFSM::ready_urc_cb()
     tr_debug("Device ready URC func called");
     if (_state == STATE_DEVICE_READY && _power->set_at_mode() == NSAPI_ERROR_OK) {
         tr_debug("State was STATE_DEVICE_READY and at mode ready, cancel state and move to next");
-        _queue.cancel(_event_id);
+        if (device_ready()) {
-        device_ready();
+            _queue.cancel(_event_id);
-        continue_from_state(STATE_SIM_PIN);
+            continue_from_state(STATE_SIM_PIN);
+        }
     }
 }
 

features/cellular/easy_cellular/CellularConnectionFSM.h

@@ -161,7 +161,7 @@ private:
     bool open_sim();
     bool get_network_registration(CellularNetwork::RegistrationType type, CellularNetwork::RegistrationStatus &status, bool &is_registered);
     bool is_registered();
-    void device_ready();
+    bool device_ready();
 
     // state functions to keep state machine simple
     void state_init();

features/cellular/framework/API/CellularDevice.h

@@ -114,6 +114,16 @@ public:
      *  @return network stack
      */
     virtual NetworkStack *get_stack() = 0;
+
+    /** Initialize cellular module must be called right after module is ready.
+     *  For example, when multiple modules are supported in a single AT driver this function detects
+     *  and adapts to an actual module at runtime.
+     *
+     *  @param fh    file handle used in communication to modem.
+     *
+     *  @return 0 on success
+     */
+    virtual nsapi_error_t init_module(FileHandle *fh) = 0;
 };
 
 } // namespace mbed

features/cellular/framework/AT/AT_CellularDevice.cpp

@@ -246,3 +246,8 @@ NetworkStack *AT_CellularDevice::get_stack()
     }
     return _network->get_stack();
 }
+
+nsapi_error_t AT_CellularDevice::init_module(FileHandle *fh)
+{
+    return NSAPI_ERROR_OK;
+}

features/cellular/framework/AT/AT_CellularDevice.h

@@ -81,6 +81,8 @@ public: // CellularDevice
 
     virtual NetworkStack *get_stack();
 
+    virtual nsapi_error_t init_module(FileHandle *fh);
+
 protected:
     AT_CellularNetwork *_network;
     AT_CellularSMS *_sms;